/* ============================================
SPACE HEATER BTU CALCULATOR — D-Central Technologies
“Terminal Meets Workshop” Dark Theme
============================================ */
@import url(‘https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&family=Barlow+Condensed:wght@600;700&display=swap’);
.btu-calc {
–bg-primary: #0D0D0D;
–bg-secondary: #1E1E2E;
–bg-card: #1A1A24;
–bg-input: #141420;
–bg-terminal: #0A0A0A;
–accent: #FF6E00;
–accent-glow: rgba(255, 110, 0, 0.15);
–accent-glow-strong: rgba(255, 110, 0, 0.3);
–accent-hover: #FF8C33;
–text-primary: #E8E8E8;
–text-secondary: #8A8A8A;
–text-muted: #666;
–border: #333;
–border-light: #2A2A2A;
–green: #10B981;
–green-glow: rgba(16, 185, 129, 0.15);
–red: #EF4444;
–red-glow: rgba(239, 68, 68, 0.15);
–yellow: #F59E0B;
–yellow-glow: rgba(245, 158, 11, 0.15);
–mono: ‘JetBrains Mono’, ‘Fira Code’, ‘Source Code Pro’, monospace;
–sans: ‘Inter’, -apple-system, BlinkMacSystemFont, sans-serif;
–heading: ‘Barlow Condensed’, ‘Oswald’, sans-serif;
–radius: 8px;
–transition: 0.2s ease;
}
.btu-calc {
max-width: 1280px;
margin: 0 auto;
font-family: var(–sans);
color: var(–text-primary);
line-height: 1.7;
-webkit-font-smoothing: antialiased;
}
.btu-calc *, .btu-calc *::before, .btu-calc *::after {
box-sizing: border-box;
}
/* —- Typography —- */
.btu-calc h1 {
font-family: var(–heading);
font-weight: 700;
font-size: clamp(1.8rem, 4vw, 2.8rem);
line-height: 1.15;
color: var(–text-primary);
margin: 0 0 0.5em;
text-transform: uppercase;
letter-spacing: 0.02em;
}
.btu-calc h1 span.accent {
color: var(–accent);
}
.btu-calc h2 {
font-family: var(–heading);
font-weight: 700;
font-size: clamp(1.3rem, 3vw, 1.8rem);
line-height: 1.2;
color: var(–text-primary);
margin: 0 0 0.6em;
text-transform: uppercase;
letter-spacing: 0.02em;
}
.btu-calc h3 {
font-family: var(–heading);
font-weight: 600;
font-size: clamp(1.1rem, 2.5vw, 1.35rem);
line-height: 1.25;
color: var(–text-primary);
margin: 0 0 0.5em;
text-transform: uppercase;
}
.btu-calc p {
margin: 0 0 1em;
color: var(–text-primary);
}
.btu-calc p.secondary {
color: var(–text-secondary);
font-size: 0.95rem;
}
.btu-calc a {
color: var(–accent);
text-decoration: none;
transition: color var(–transition);
}
.btu-calc a:hover {
color: var(–accent-hover);
text-decoration: underline;
}
/* —- Hero / Intro —- */
.btu-calc__hero {
background: linear-gradient(135deg, var(–bg-secondary) 0%, var(–bg-primary) 100%);
border: 1px solid var(–border);
border-radius: var(–radius);
padding: clamp(1.5rem, 4vw, 3rem);
margin-bottom: 2rem;
position: relative;
overflow: hidden;
}
.btu-calc__hero::before {
content: ”;
position: absolute;
top: 0;
right: 0;
width: 300px;
height: 300px;
background: radial-gradient(circle, var(–accent-glow) 0%, transparent 70%);
pointer-events: none;
}
.btu-calc__hero-badge {
display: inline-block;
background: var(–accent);
color: #fff;
font-family: var(–mono);
font-size: 0.7rem;
font-weight: 600;
padding: 4px 12px;
border-radius: 3px;
text-transform: uppercase;
letter-spacing: 0.08em;
margin-bottom: 1rem;
}
.btu-calc__hero-formula {
background: var(–bg-terminal);
border: 1px solid var(–border);
border-radius: 4px;
padding: 1rem 1.25rem;
margin: 1.5rem 0;
font-family: var(–mono);
font-size: 0.9rem;
color: var(–green);
overflow-x: auto;
}
.btu-calc__hero-formula .comment {
color: var(–text-muted);
}
/* —- Section Layout —- */
.btu-calc__section {
background: var(–bg-secondary);
border: 1px solid var(–border);
border-radius: var(–radius);
padding: clamp(1.25rem, 3vw, 2rem);
margin-bottom: 1.5rem;
}
.btu-calc__section-header {
display: flex;
align-items: center;
gap: 0.75rem;
margin-bottom: 1.5rem;
padding-bottom: 1rem;
border-bottom: 1px solid var(–border-light);
}
.btu-calc__section-number {
display: flex;
align-items: center;
justify-content: center;
width: 36px;
height: 36px;
min-width: 36px;
background: var(–accent);
color: #fff;
font-family: var(–mono);
font-weight: 700;
font-size: 1rem;
border-radius: 4px;
}
/* —- Form Controls —- */
.btu-calc__grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
gap: 1.25rem;
}
.btu-calc__grid–3 {
grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.btu-calc__field {
display: flex;
flex-direction: column;
gap: 0.4rem;
}
.btu-calc__field–full {
grid-column: 1 / -1;
}
.btu-calc__label {
font-size: 0.8rem;
font-weight: 600;
color: var(–text-secondary);
text-transform: uppercase;
letter-spacing: 0.06em;
font-family: var(–sans);
}
.btu-calc__label-hint {
font-weight: 400;
color: var(–text-muted);
text-transform: none;
letter-spacing: normal;
font-size: 0.75rem;
}
.btu-calc__input,
.btu-calc__select {
background: var(–bg-input);
border: 1px solid var(–border);
border-radius: 4px;
color: var(–text-primary);
font-family: var(–mono);
font-size: 0.95rem;
padding: 0.65rem 0.85rem;
transition: border-color var(–transition), box-shadow var(–transition);
width: 100%;
-webkit-appearance: none;
appearance: none;
}
.btu-calc__input:focus,
.btu-calc__select:focus {
outline: none;
border-color: var(–accent);
box-shadow: 0 0 0 3px var(–accent-glow);
}
.btu-calc__select {
background-image: url(“data:image/svg+xml,%3Csvg xmlns=’http://www.w3.org/2000/svg’ width=’12’ height=’8′ viewBox=’0 0 12 8’%3E%3Cpath d=’M1 1l5 5 5-5′ stroke=’%238A8A8A’ stroke-width=’1.5′ fill=’none’/%3E%3C/svg%3E”);
background-repeat: no-repeat;
background-position: right 0.85rem center;
padding-right: 2.5rem;
cursor: pointer;
}
.btu-calc__select option {
background: var(–bg-secondary);
color: var(–text-primary);
}
.btu-calc__input-row {
display: flex;
gap: 0.75rem;
align-items: end;
}
.btu-calc__input-row .btu-calc__field {
flex: 1;
}
.btu-calc__dim-x {
color: var(–text-muted);
font-family: var(–mono);
font-size: 1rem;
padding-bottom: 0.7rem;
flex: 0 0 auto;
}
.btu-calc__unit-toggle {
display: inline-flex;
border: 1px solid var(–border);
border-radius: 4px;
overflow: hidden;
margin-left: 0.75rem;
}
.btu-calc__unit-btn {
background: transparent;
border: none;
color: var(–text-secondary);
font-family: var(–mono);
font-size: 0.75rem;
padding: 0.3rem 0.65rem;
cursor: pointer;
transition: all var(–transition);
}
.btu-calc__unit-btn.active {
background: var(–accent);
color: #fff;
}
/* —- Results —- */
.btu-calc__results {
background: linear-gradient(135deg, var(–bg-secondary) 0%, rgba(30, 30, 46, 0.7) 100%);
border: 1px solid var(–accent);
border-radius: var(–radius);
padding: clamp(1.25rem, 3vw, 2rem);
margin-bottom: 1.5rem;
box-shadow: 0 0 30px var(–accent-glow);
}
.btu-calc__results-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 1.25rem;
}
.btu-calc__result-card {
background: var(–bg-primary);
border: 1px solid var(–border);
border-radius: 6px;
padding: 1.25rem;
text-align: center;
transition: border-color var(–transition), box-shadow var(–transition);
}
.btu-calc__result-card:hover {
border-color: var(–accent);
box-shadow: 0 0 15px var(–accent-glow);
}
.btu-calc__result-label {
font-size: 0.7rem;
font-weight: 600;
color: var(–text-secondary);
text-transform: uppercase;
letter-spacing: 0.08em;
margin-bottom: 0.5rem;
font-family: var(–sans);
}
.btu-calc__result-value {
font-family: var(–mono);
font-size: clamp(1.3rem, 3vw, 1.8rem);
font-weight: 700;
color: var(–accent);
line-height: 1.1;
}
.btu-calc__result-value.green {
color: var(–green);
}
.btu-calc__result-value.red {
color: var(–red);
}
.btu-calc__result-unit {
font-size: 0.7em;
font-weight: 400;
color: var(–text-secondary);
margin-left: 2px;
}
.btu-calc__result-note {
font-size: 0.75rem;
color: var(–text-muted);
margin-top: 0.3rem;
font-family: var(–sans);
}
/* —- Coverage Meter —- */
.btu-calc__coverage {
margin-top: 1.5rem;
padding: 1.25rem;
background: var(–bg-primary);
border: 1px solid var(–border);
border-radius: 6px;
}
.btu-calc__coverage-header {
display: flex;
justify-content: space-between;
align-items: center;
margin-bottom: 0.75rem;
}
.btu-calc__coverage-pct {
font-family: var(–mono);
font-size: 1.4rem;
font-weight: 700;
}
.btu-calc__coverage-bar-wrap {
background: var(–bg-terminal);
border-radius: 4px;
height: 28px;
overflow: hidden;
position: relative;
}
.btu-calc__coverage-bar {
height: 100%;
border-radius: 4px;
transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1), background 0.3s ease;
position: relative;
min-width: 2px;
}
.btu-calc__coverage-bar::after {
content: ”;
position: absolute;
right: 0;
top: 0;
bottom: 0;
width: 40px;
background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15));
}
.btu-calc__coverage-markers {
display: flex;
justify-content: space-between;
padding: 0.4rem 0 0;
}
.btu-calc__coverage-marker {
font-family: var(–mono);
font-size: 0.65rem;
color: var(–text-muted);
}
.btu-calc__coverage-msg {
margin-top: 0.75rem;
padding: 0.75rem 1rem;
border-radius: 4px;
font-size: 0.9rem;
line-height: 1.5;
display: flex;
align-items: flex-start;
gap: 0.5rem;
}
.btu-calc__coverage-msg.status-good {
background: var(–green-glow);
border: 1px solid rgba(16, 185, 129, 0.3);
color: var(–green);
}
.btu-calc__coverage-msg.status-warn {
background: var(–yellow-glow);
border: 1px solid rgba(245, 158, 11, 0.3);
color: var(–yellow);
}
.btu-calc__coverage-msg.status-low {
background: var(–red-glow);
border: 1px solid rgba(239, 68, 68, 0.3);
color: var(–red);
}
.btu-calc__coverage-msg.status-over {
background: var(–accent-glow);
border: 1px solid rgba(255, 110, 0, 0.3);
color: var(–accent);
}
.btu-calc__coverage-icon {
font-size: 1.1rem;
flex-shrink: 0;
line-height: 1.4;
}
/* —- Comparison Section —- */
.btu-calc__comparison {
display: grid;
grid-template-columns: 1fr auto 1fr;
gap: 0;
align-items: stretch;
margin: 1.5rem 0;
}
.btu-calc__comp-card {
background: var(–bg-primary);
border: 1px solid var(–border);
border-radius: var(–radius);
padding: 1.5rem;
text-align: center;
}
.btu-calc__comp-card–miner {
border-color: var(–accent);
box-shadow: 0 0 20px var(–accent-glow);
}
.btu-calc__comp-vs {
display: flex;
align-items: center;
justify-content: center;
padding: 0 1rem;
font-family: var(–heading);
font-weight: 700;
font-size: 1.3rem;
color: var(–text-muted);
}
.btu-calc__comp-icon {
font-size: 2.5rem;
margin-bottom: 0.75rem;
line-height: 1;
}
.btu-calc__comp-title {
font-family: var(–heading);
font-weight: 700;
font-size: 1rem;
text-transform: uppercase;
color: var(–text-primary);
margin-bottom: 1rem;
}
.btu-calc__comp-row {
display: flex;
justify-content: space-between;
padding: 0.5rem 0;
border-bottom: 1px solid var(–border-light);
font-size: 0.85rem;
}
.btu-calc__comp-row:last-child {
border-bottom: none;
}
.btu-calc__comp-row-label {
color: var(–text-secondary);
}
.btu-calc__comp-row-value {
font-family: var(–mono);
font-weight: 600;
color: var(–text-primary);
}
.btu-calc__comp-row-value.green {
color: var(–green);
}
.btu-calc__comp-row-value.accent {
color: var(–accent);
}
.btu-calc__comp-highlight {
margin-top: 1rem;
padding: 0.75rem;
border-radius: 4px;
font-family: var(–mono);
font-size: 0.85rem;
font-weight: 600;
text-align: center;
}
.btu-calc__comp-highlight.savings {
background: var(–green-glow);
border: 1px solid rgba(16, 185, 129, 0.3);
color: var(–green);
}
.btu-calc__comp-highlight.neutral {
background: var(–bg-secondary);
border: 1px solid var(–border);
color: var(–text-secondary);
}
/* —- Cost Breakdown —- */
.btu-calc__cost-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
gap: 1rem;
margin-top: 1rem;
}
.btu-calc__cost-card {
background: var(–bg-primary);
border: 1px solid var(–border);
border-radius: 6px;
padding: 1rem;
text-align: center;
}
.btu-calc__cost-label {
font-size: 0.7rem;
text-transform: uppercase;
letter-spacing: 0.06em;
color: var(–text-secondary);
margin-bottom: 0.4rem;
font-family: var(–sans);
}
.btu-calc__cost-value {
font-family: var(–mono);
font-size: 1.4rem;
font-weight: 700;
}
.btu-calc__cost-sub {
font-size: 0.7rem;
color: var(–text-muted);
margin-top: 0.2rem;
font-family: var(–sans);
}
/* —- Savings Banner —- */
.btu-calc__savings-banner {
background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(255, 110, 0, 0.08) 100%);
border: 1px solid var(–green);
border-radius: var(–radius);
padding: 1.5rem;
text-align: center;
margin: 1.5rem 0;
box-shadow: 0 0 25px var(–green-glow);
}
.btu-calc__savings-title {
font-family: var(–heading);
font-weight: 700;
font-size: 1rem;
text-transform: uppercase;
color: var(–green);
margin-bottom: 0.75rem;
}
.btu-calc__savings-amount {
font-family: var(–mono);
font-size: clamp(1.8rem, 5vw, 2.8rem);
font-weight: 700;
color: var(–green);
line-height: 1;
}
.btu-calc__savings-period {
font-family: var(–mono);
font-size: 0.85rem;
color: var(–text-secondary);
margin-top: 0.3rem;
}
.btu-calc__savings-note {
font-size: 0.8rem;
color: var(–text-muted);
margin-top: 0.75rem;
line-height: 1.5;
}
/* —- Key Message Box —- */
.btu-calc__keymsg {
background: var(–bg-terminal);
border-left: 3px solid var(–accent);
border-radius: 0 4px 4px 0;
padding: 1.25rem 1.5rem;
margin: 1.5rem 0;
font-size: 0.95rem;
line-height: 1.6;
}
.btu-calc__keymsg strong {
color: var(–accent);
}
/* —- CTA Button —- */
.btu-calc__cta-wrap {
text-align: center;
margin: 2rem 0;
}
.btu-calc__cta {
display: inline-block;
background: var(–accent);
color: #fff;
font-family: var(–heading);
font-weight: 700;
font-size: 1rem;
text-transform: uppercase;
letter-spacing: 0.06em;
padding: 0.9rem 2.25rem;
border-radius: 4px;
border: none;
cursor: pointer;
text-decoration: none;
transition: all var(–transition);
box-shadow: 0 0 20px var(–accent-glow);
}
.btu-calc__cta:hover {
background: var(–accent-hover);
color: #fff;
text-decoration: none;
box-shadow: 0 0 30px var(–accent-glow-strong);
transform: translateY(-1px);
}
.btu-calc__cta–secondary {
background: transparent;
border: 2px solid var(–accent);
color: var(–accent);
box-shadow: none;
margin-left: 0.75rem;
}
.btu-calc__cta–secondary:hover {
background: var(–accent);
color: #fff;
}
/* —- Disclaimer —- */
.btu-calc__disclaimer {
font-size: 0.75rem;
color: var(–text-muted);
line-height: 1.6;
margin-top: 0.5rem;
padding: 0.75rem 1rem;
background: var(–bg-terminal);
border-radius: 4px;
border: 1px solid var(–border-light);
}
.btu-calc__disclaimer::before {
content: ‘// ‘;
font-family: var(–mono);
color: var(–text-muted);
}
/* —- Model Comparison Table —- */
.btu-calc__table-wrap {
overflow-x: auto;
margin: 1.5rem 0;
-webkit-overflow-scrolling: touch;
}
.btu-calc__table {
width: 100%;
border-collapse: collapse;
font-size: 0.85rem;
min-width: 700px;
}
.btu-calc__table th {
border-bottom: 2px solid var(–accent);
padding: 0.65rem 0.85rem;
text-align: left;
font-family: var(–sans);
font-weight: 600;
font-size: 0.75rem;
text-transform: uppercase;
letter-spacing: 0.05em;
color: var(–text-secondary);
white-space: nowrap;
}
.btu-calc__table td {
border-bottom: 1px solid var(–border-light);
padding: 0.65rem 0.85rem;
color: var(–text-primary);
vertical-align: middle;
}
.btu-calc__table tr:hover td {
background: rgba(255, 110, 0, 0.03);
}
.btu-calc__table td a {
color: var(–accent);
font-weight: 600;
}
.btu-calc__table .mono {
font-family: var(–mono);
font-weight: 500;
}
.btu-calc__table .check {
color: var(–green);
}
/* —- FAQ Section —- */
.btu-calc__faq {
margin: 2rem 0;
}
.btu-calc__faq details {
background: var(–bg-secondary);
border: 1px solid var(–border);
border-radius: 6px;
margin-bottom: 0.75rem;
overflow: hidden;
transition: border-color var(–transition);
}
.btu-calc__faq details[open] {
border-color: var(–accent);
}
.btu-calc__faq details summary {
padding: 1rem 1.25rem;
cursor: pointer;
font-weight: 600;
font-size: 0.95rem;
color: var(–text-primary);
list-style: none;
display: flex;
align-items: center;
justify-content: space-between;
gap: 1rem;
transition: color var(–transition);
}
.btu-calc__faq details summary::-webkit-details-marker {
display: none;
}
.btu-calc__faq details summary::after {
content: ‘+’;
font-family: var(–mono);
font-size: 1.2rem;
color: var(–accent);
flex-shrink: 0;
transition: transform var(–transition);
}
.btu-calc__faq details[open] summary::after {
content: ‘2212’;
}
.btu-calc__faq details summary:hover {
color: var(–accent);
}
.btu-calc__faq details .faq-answer {
padding: 0 1.25rem 1.25rem;
color: var(–text-secondary);
font-size: 0.9rem;
line-height: 1.7;
}
/* —- Content Sections Below Calc —- */
.btu-calc__content-section {
margin: 2.5rem 0;
}
.btu-calc__content-section p {
color: var(–text-secondary);
font-size: 0.95rem;
line-height: 1.8;
}
/* —- Divider —- */
.btu-calc__divider {
border: none;
border-top: 1px solid var(–border);
margin: 2.5rem 0;
}
/* —- Recommended Models —- */
.btu-calc__recommendations {
margin-top: 1.5rem;
}
.btu-calc__rec-cards {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
gap: 1rem;
margin-top: 1rem;
}
.btu-calc__rec-card {
background: var(–bg-primary);
border: 1px solid var(–border);
border-radius: 6px;
padding: 1.25rem;
transition: border-color var(–transition), box-shadow var(–transition);
}
.btu-calc__rec-card:hover {
border-color: var(–accent);
box-shadow: 0 0 15px var(–accent-glow);
}
.btu-calc__rec-card.best-match {
border-color: var(–green);
box-shadow: 0 0 15px var(–green-glow);
}
.btu-calc__rec-badge {
display: inline-block;
font-family: var(–mono);
font-size: 0.65rem;
font-weight: 600;
text-transform: uppercase;
padding: 2px 8px;
border-radius: 3px;
margin-bottom: 0.5rem;
}
.btu-calc__rec-badge.best {
background: var(–green-glow);
color: var(–green);
border: 1px solid rgba(16, 185, 129, 0.3);
}
.btu-calc__rec-badge.good {
background: var(–accent-glow);
color: var(–accent);
border: 1px solid rgba(255, 110, 0, 0.3);
}
.btu-calc__rec-badge.supplemental {
background: var(–yellow-glow);
color: var(–yellow);
border: 1px solid rgba(245, 158, 11, 0.3);
}
.btu-calc__rec-name {
font-family: var(–heading);
font-weight: 700;
font-size: 1.05rem;
text-transform: uppercase;
margin-bottom: 0.5rem;
}
.btu-calc__rec-name a {
color: var(–text-primary);
}
.btu-calc__rec-name a:hover {
color: var(–accent);
}
.btu-calc__rec-specs {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 0.3rem 1rem;
font-size: 0.8rem;
margin-bottom: 0.5rem;
}
.btu-calc__rec-spec-label {
color: var(–text-muted);
}
.btu-calc__rec-spec-val {
font-family: var(–mono);
font-weight: 500;
color: var(–text-primary);
text-align: right;
}
.btu-calc__rec-coverage {
font-family: var(–mono);
font-size: 0.85rem;
font-weight: 600;
margin-top: 0.5rem;
padding-top: 0.5rem;
border-top: 1px solid var(–border-light);
}
/* —- Province / Rate —- */
.btu-calc__rate-display {
display: inline-flex;
align-items: center;
gap: 0.5rem;
background: var(–bg-terminal);
border: 1px solid var(–border);
border-radius: 4px;
padding: 0.4rem 0.75rem;
font-family: var(–mono);
font-size: 0.8rem;
color: var(–text-secondary);
margin-top: 0.5rem;
}
.btu-calc__rate-display .rate-val {
color: var(–accent);
font-weight: 600;
}
/* —- Responsive —- */
@media (max-width: 768px) {
.btu-calc__comparison {
grid-template-columns: 1fr;
gap: 0;
}
.btu-calc__comp-vs {
padding: 0.75rem 0;
font-size: 1.1rem;
}
.btu-calc__input-row {
flex-direction: column;
gap: 1rem;
}
.btu-calc__dim-x {
display: none;
}
.btu-calc__cta–secondary {
margin-left: 0;
margin-top: 0.75rem;
}
.btu-calc__cta-wrap {
display: flex;
flex-direction: column;
align-items: center;
gap: 0;
}
.btu-calc__savings-amount {
font-size: 2rem;
}
}
@media (max-width: 480px) {
.btu-calc__results-grid {
grid-template-columns: 1fr 1fr;
}
.btu-calc__cost-grid {
grid-template-columns: 1fr 1fr;
}
.btu-calc__rec-cards {
grid-template-columns: 1fr;
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.btu-calc__rec-specs {
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.btu-calc__results-grid {
grid-template-columns: 1fr;
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.btu-calc__cost-grid {
grid-template-columns: 1fr;
}
}
/* —- Animations —- */
@keyframes countUp {
from { opacity: 0; transform: translateY(8px); }
to { opacity: 1; transform: translateY(0); }
}
.btu-calc__result-value[data-animated] {
animation: countUp 0.4s ease-out;
}
/* —- Print —- */
@media print {
.btu-calc {
color: #000;
}
.btu-calc__section,
.btu-calc__results,
.btu-calc__hero {
border-color: #ccc;
background: #fff;
box-shadow: none;
}
.btu-calc__result-value,
.btu-calc__cost-value,
.btu-calc__coverage-pct {
color: #000;
}
}
(function() {
‘use strict’;
/* ================================================
D-Central Space Heater BTU Calculator — Engine
================================================ */
// —– State —–
var state = {
dimUnit: ‘ft’, // ‘ft’ or ‘m’
tempUnit: ‘F’, // ‘C’ or ‘F’
btcPrice: 130000, // CAD fallback — updated via API
networkDiff: 1.145e14, // fallback — updated via API
btcPriceLoaded: false
};
// —– Space Heater Product Data —–
var MODELS = {
s9: { name: ‘S9 Space Heater Edition’, watts: 1400, btu: 4777, hash: 13, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 45, price: 235, url: ‘/product/antminer-s9-space-heater-edition/’, roomMin: 150, roomMax: 250 },
l3: { name: ‘L3+ Space Heater Edition’, watts: 800, btu: 2730, hash: 504, hashUnit: ‘MH/s’, algo: ‘Scrypt’, noise: 40, price: 295, url: ‘/product/antminer-l3-space-heater-edition/’, roomMin: 80, roomMax: 150 },
s17: { name: ‘S17 Space Heater Edition’, watts: 1000, btu: 3412, hash: 33, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 45, price: 530, url: ‘/product/antminer-s17-space-heater-edition/’, roomMin: 100, roomMax: 200 },
s19: { name: ‘S19 Space Heater Edition’, watts: 3250, btu: 11089, hash: 56, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 40, price: 755, url: ‘/product/antminer-s19-space-heater-edition/’, roomMin: 350, roomMax: 600 },
slim: { name: ‘Slim Edition’, watts: 900, btu: 3071, hash: 35, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 35, price: 560, url: ‘/product/antminer-slim-edition/’, roomMin: 100, roomMax: 175 },
loki: { name: ‘Loki Edition’, watts: 1150, btu: 3924, hash: 48, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 40, price: 585, url: ‘/product/antminer-loki-edition/’, roomMin: 120, roomMax: 225 },
l7: { name: ‘L7 Pivotal Edition’, watts: 1300, btu: 4436, hash: 3.5, hashUnit: ‘GH/s’, algo: ‘Scrypt’, noise: 40, price: 2350, url: ‘/product/l7-heater-pivotal-edition-3-5ghs-1300w/’, roomMin: 140, roomMax: 250 },
stealth: { name: ‘StealthMiner’, watts: 900, btu: 3071, hash: 35, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 35, price: 850, url: ‘/product/the-stealthminer/’, roomMin: 100, roomMax: 175 },
chimney: { name: ‘BitChimney’, watts: 800, btu: 2730, hash: 504, hashUnit: ‘MH/s’, algo: ‘Scrypt’, noise: 35, price: 540, url: ‘/product/the-bitchimney/’, roomMin: 80, roomMax: 150 },
bitaxe: { name: ‘Bitaxe’, watts: 25, btu: 85, hash: 1.2, hashUnit: ‘TH/s’, algo: ‘SHA-256’, noise: 30, price: 250, url: ‘/product-category/open-source-miners/’, roomMin: 0, roomMax: 10 }
};
// —– Insulation multipliers (BTU per sq ft per degree F delta) —–
var INSULATION = {
poor: { factor: 0.35, label: ‘Poor’ },
average: { factor: 0.28, label: ‘Average’ },
good: { factor: 0.22, label: ‘Good’ },
excellent: { factor: 0.16, label: ‘Excellent’ }
};
// —– Climate zone default outdoor temps (F) —–
var CLIMATE_DEFAULTS_F = {
extreme: -22,
cold: 5,
moderate: 23,
mild: 41
};
// —– Fetch BTC price and difficulty —–
function fetchBtcData() {
// Try CoinGecko for CAD price
fetch(‘https://api.coingecko.com/api/v3/simple/price?ids=bitcoin&vs_currencies=cad’)
.then(function(r) { return r.json(); })
.then(function(data) {
if (data && data.bitcoin && data.bitcoin.cad) {
state.btcPrice = data.bitcoin.cad;
state.btcPriceLoaded = true;
calculate();
}
})
.catch(function() {
// Use fallback price
});
// Fetch network difficulty from mempool.space
fetch(‘https://mempool.space/api/v1/mining/hashrate/1m’)
.then(function(r) { return r.json(); })
.then(function(data) {
if (data && data.difficulty && data.difficulty.length > 0) {
var latest = data.difficulty[data.difficulty.length – 1];
if (latest && latest.difficulty) {
state.networkDiff = latest.difficulty;
calculate();
}
}
})
.catch(function() {
// Fallback to mempool difficulty API
fetch(‘https://mempool.space/api/v1/difficulty-adjustment’)
.then(function(r) { return r.json(); })
.then(function(data) {
if (data && data.difficultyChange !== undefined) {
// Keep existing fallback if this doesn’t give raw difficulty
}
})
.catch(function() {});
});
}
// —– Unit conversion helpers —–
function ftToM(ft) { return ft * 0.3048; }
function mToFt(m) { return m / 0.3048; }
function cToF(c) { return (c * 9/5) + 32; }
function fToC(f) { return (f – 32) * 5/9; }
// —– DOM helpers —–
function $(id) { return document.getElementById(id); }
function show(id) { $(id).style.display = ”; }
function hide(id) { $(id).style.display = ‘none’; }
function val(id) { return parseFloat($(id).value) || 0; }
function setText(id, text) { $(id).textContent = text; }
function setHTML(id, html) { $(id).innerHTML = html; }
function formatNum(n, decimals) {
if (decimals === undefined) decimals = 0;
return n.toLocaleString(‘en-US’, { minimumFractionDigits: decimals, maximumFractionDigits: decimals });
}
function formatCurrency(n) {
if (n < 0) return '-$' + formatNum(Math.abs(n), 2);
return '$' + formatNum(n, 2);
}
// —– Toggle dimension unit —–
window.setDimUnit = function(unit) {
var btns = $('dimUnitToggle').querySelectorAll('.btu-calc__unit-btn');
btns.forEach(function(b) { b.classList.toggle('active', b.getAttribute('data-unit') === unit); });
var lengthEl = $('roomLength');
var widthEl = $('roomWidth');
var heightEl = $('roomHeight');
if (unit !== state.dimUnit) {
if (unit === 'm') {
if (lengthEl.value) lengthEl.value = (parseFloat(lengthEl.value) * 0.3048).toFixed(1);
if (widthEl.value) widthEl.value = (parseFloat(widthEl.value) * 0.3048).toFixed(1);
if (heightEl.value) heightEl.value = (parseFloat(heightEl.value) * 0.3048).toFixed(1);
lengthEl.placeholder = '4.6';
widthEl.placeholder = '3.7';
heightEl.placeholder = '2.4';
} else {
if (lengthEl.value) lengthEl.value = (parseFloat(lengthEl.value) / 0.3048).toFixed(1);
if (widthEl.value) widthEl.value = (parseFloat(widthEl.value) / 0.3048).toFixed(1);
if (heightEl.value) heightEl.value = (parseFloat(heightEl.value) / 0.3048).toFixed(1);
lengthEl.placeholder = '15';
widthEl.placeholder = '12';
heightEl.placeholder = '8';
}
}
state.dimUnit = unit;
calculate();
};
// —– Toggle temperature unit —–
window.setTempUnit = function(unit) {
var btns = $('tempUnitToggle').querySelectorAll('.btu-calc__unit-btn');
btns.forEach(function(b) { b.classList.toggle('active', b.getAttribute('data-unit') === unit); });
var indoorEl = $('indoorTemp');
var outdoorEl = $('outdoorTemp');
if (unit !== state.tempUnit) {
if (unit === 'C') {
if (indoorEl.value) indoorEl.value = Math.round(fToC(parseFloat(indoorEl.value)));
if (outdoorEl.value) outdoorEl.value = Math.round(fToC(parseFloat(outdoorEl.value)));
} else {
if (indoorEl.value) indoorEl.value = Math.round(cToF(parseFloat(indoorEl.value)));
if (outdoorEl.value) outdoorEl.value = Math.round(cToF(parseFloat(outdoorEl.value)));
}
}
state.tempUnit = unit;
calculate();
};
// —– Update outdoor temp when climate zone changes —–
window.updateOutdoorTemp = function() {
var climate = $('climate').value;
var defaultF = CLIMATE_DEFAULTS_F[climate];
if (state.tempUnit === 'C') {
$('outdoorTemp').value = Math.round(fToC(defaultF));
} else {
$('outdoorTemp').value = defaultF;
}
};
// —– Model change handler —–
window.onModelChange = function() {
var sel = $('heaterModel');
var modelKey = sel.value;
if (modelKey === 'custom') {
show('customWattRow');
} else {
hide('customWattRow');
}
};
// —– Province change handler —–
window.onProvinceChange = function() {
var prov = $('province');
if (prov.value === 'custom_rate') {
show('customRateField');
} else {
hide('customRateField');
}
};
// —– Get electricity rate —–
function getRate() {
var prov = $('province');
if (prov.value === 'custom_rate') {
return parseFloat($('customRate').value) || 0.06;
}
return parseFloat(prov.value) || 0.06;
}
// —– Estimate daily BTC revenue for SHA-256 miner —–
function estimateBtcPerDay(hashrateTHs) {
// Revenue = (hashrate * 86400 * block_reward) / (difficulty * 2^32)
var blockReward = 3.125;
var hashrateHs = hashrateTHs * 1e12;
var dailyBtc = (hashrateHs * 86400 * blockReward) / (state.networkDiff * Math.pow(2, 32));
// Subtract ~2% pool fee
return dailyBtc * 0.98;
}
// —– Estimate Scrypt mining revenue (rough CAD/day) —–
// Scrypt miners (L3+, L7) mine LTC/DOGE merged. Use rough estimate based on wattage efficiency.
// At current conditions, Scrypt mining yields roughly $0.02-0.05/day per MH/s for L3+ class.
// We use a conservative fixed ratio tied to wattage for Scrypt since exact LTC difficulty API adds complexity.
function estimateScryptCadPerDay(watts) {
// Very rough: ~$0.0015 CAD per watt per day for Scrypt miners at current conditions
// This yields ~$1.20/day for an 800W L3+ and ~$1.95/day for a 1300W L7
return watts * 0.0015;
}
// —– Get selected miner data —–
function getMinerData() {
var sel = $('heaterModel');
var modelKey = sel.value;
if (modelKey === 'custom') {
var cw = parseFloat($('customWatts').value) || 0;
var ch = parseFloat($('customHash').value) || 0;
return {
key: 'custom',
name: 'Mineur personnalisé',
watts: cw,
btu: cw * 3.412,
hash: ch,
hashUnit: 'TH/s',
algo: 'SHA-256',
noise: 0,
price: 0,
url: '/shop/'
};
}
var m = MODELS[modelKey];
return {
key: modelKey,
name: m.name,
watts: m.watts,
btu: m.btu,
hash: m.hash,
hashUnit: m.hashUnit,
algo: m.algo,
noise: m.noise,
price: m.price,
url: m.url
};
}
// —– Build recommendation cards —–
function buildRecommendations(btuNeeded) {
var container = $('recCards');
container.innerHTML = '';
if (!btuNeeded || btuNeeded = 70) {
badgeClass = ‘good’;
badgeText = ‘Bonne option’;
} else {
badgeClass = ‘supplemental’;
badgeText = ‘À considérer’;
}
var cardClass = ‘btu-calc__rec-card’ + (idx === 0 ? ‘ best-match’ : ”);
var html = ‘
Outil exclusif D-Central
Calculateur BTU Chaufferette Bitcoin
Chaque watt consommé par un mineur Bitcoin se convertit en chaleur. 100 %. C’est la première loi de la thermodynamique. Un mineur ASIC de 1 400W produit exactement la même chaleur qu’une chaufferette électrique de 1 400W. La différence ? Le mineur gagne aussi du Bitcoin en chauffant votre pièce.
Utilisez ce calculateur pour dimensionner la bonne chaufferette Bitcoin pour votre pièce, comparer les coûts avec une chaufferette électrique traditionnelle, et voir combien de Bitcoin vous pourriez gagner en restant au chaud cet hiver.
// L’équation fondamentale du chauffage Bitcoin
1 Watt (electric heater) = 1 Watt (Bitcoin miner) = 3.412 BTU/hr
// Même chaleur. Même coût. Mais l’un mine aussi du Bitcoin.
1 Watt (electric heater) = 1 Watt (Bitcoin miner) = 3.412 BTU/hr
// Même chaleur. Même coût. Mais l’un mine aussi du Bitcoin.
Les Canadiens dépensent 2 000 $+ par an en chauffage domestique. Et si cet argent accumulait aussi des sats ? D-Central Technologies a été le pionnier du concept de chaufferette Bitcoin au Canada. Nous prenons du matériel de minage ASIC éprouvé, le reconditionons avec des ventilateurs silencieux et des boîtiers sur mesure, et livrons un appareil de chauffage prêt à l’emploi qui mine aussi du Bitcoin.
1
Besoins de chauffage de la pièce
Entrez les dimensions et conditions de votre pièce. Nous calculerons la puissance BTU nécessaire pour la maintenir confortable.
Faible — Vieille maison, fenêtres à simple vitrage, courants d’air
Moyenne — Isolation résidentielle standard
Bonne — Bien isolée, fenêtres à double vitrage
Excellente — Construction neuve, triple vitrage, étanche
Nord du Canada (froid extrême, -30°C / -22°F)
Sud du Canada / Nord des É.-U. (-15°C / 5°F)
Centre des É.-U. (modéré, -5°C / 23°F)
Sud des É.-U. (doux, 5°C / 41°F)
2
Production de chaleur du mineur
Sélectionnez un modèle de chaufferette Bitcoin pour voir sa production de chaleur et sa couverture de votre pièce.
S9 Space Heater Edition — 1,400W / 4,777 BTU/hr / 13 TH/s
L3+ Space Heater Edition — 800W / 2,730 BTU/hr / 504 MH/s
S17 Space Heater Edition — 1,000W / 3,412 BTU/hr / 33 TH/s
S19 Space Heater Edition — 3,250W / 11,089 BTU/hr / 56 TH/s
Slim Edition — 900W / 3,071 BTU/hr / 35 TH/s
Loki Edition — 1,150W / 3,924 BTU/hr / 48 TH/s
L7 Pivotal Edition — 1,300W / 4,436 BTU/hr / 3.5 GH/s
StealthMiner — 900W / 3,071 BTU/hr / 35 TH/s
BitChimney — 800W / 2,730 BTU/hr / 504 MH/s
Bitaxe (any model) — ~25W / 85 BTU/hr / Supplemental only
Puissance personnalisée — Entrez la vôtre
3
Comparaison des coûts
Voyez comment une chaufferette Bitcoin se compare à une chaufferette électrique traditionnelle. Même chaleur, même coût d’électricité — mais l’une mine aussi du Bitcoin.
Québec — 0,0376 $/kWh (le plus bas au Canada)
Manitoba — $0.0575/kWh
British Columbia — $0.073/kWh
Newfoundland & Labrador — $0.087/kWh
New Brunswick — $0.094/kWh
Prince Edward Island — $0.104/kWh
Saskatchewan — $0.105/kWh
Alberta — $0.117/kWh
Ontario — $0.13/kWh
Nova Scotia — $0.146/kWh
US — Low (WA, LA, WV) ~$0.08/kWh
US — Average ~$0.12/kWh
US — High (CA, CT, MA) ~$0.18/kWh
Tarif personnalisé — Entrez le vôtre
Tarif utilisé : $0.130/kWh
La physique est claire : Une chaufferette électrique de 1 400W et un mineur Bitcoin de 1 400W produisent une chaleur identique — 4 777 BTU/h. Le coût d’électricité est le même. La production thermique est la même. La seule différence est que le mineur Bitcoin effectue aussi des milliards de calculs cryptographiques par seconde, gagnant du Bitcoin avec chaque hash. Vous alliez dépenser cette électricité pour le chauffage de toute façon. Faites-la travailler deux fois.
Comment fonctionnent les chaufferettes de minage Bitcoin
La science derrière une chaufferette Bitcoin n’est pas du marketing — c’est de la thermodynamique. When electricity flows through any resistive load, whether a ceramic heating element or a silicon ASIC chip, all of that electrical energy converts to thermal energy. This is the first law of thermodynamics: energy is conserved. A 1,500-watt device consumes 1,500 watts of electricity and produces 1,500 watts of heat, regardless of whether it is a $30 space heater from a hardware store or a $300 Bitcoin miner from D-Central.
Traditional electric space heaters convert electricity to heat through simple resistive elements. The electricity flows, the element resists, heat radiates into your room. That is the entire process. A Bitcoin ASIC miner does the same thing, but the resistance comes from billions of transistors performing SHA-256 hash computations at speeds exceeding 10 trillion hashes per second. The chips heat up. The fans push warm air into your room. And as a byproduct of that computation, the miner earns Bitcoin by contributing to the security of the Bitcoin network. Every hash is a lottery ticket for a block reward. You are heating your home and participating in the most decentralized monetary network ever created — simultaneously.
D-Central’s Space Heater Editions are purpose-built for residential use. We replace the industrial-grade fans (which can reach 80+ dB) with silent Noctua or Arctic P14 Max fans that operate at 35–45 dB — quieter than a refrigerator. We enclose the hardware in custom 3D-printed cases designed for airflow and aesthetics. We flash optimized firmware (BraiinsOS+ or Vnish) that lets you fine-tune wattage, hashrate, and fan speeds from your phone. The result is a plug-and-play appliance that heats your room, mines Bitcoin, and looks like it belongs in a modern home — not a data center.
Choisir le bon modèle de chaufferette
Chaque pièce est différente. Une chambre de 150 pieds carrés nécessite beaucoup moins de chaleur qu’un salon de 400 pieds carrés. Voici une comparaison complète de chaque modèle de chaufferette D-Central pour vous aider à adapter la production de chaleur à la taille de la pièce.
| Modèle | Puissance | BTU/hr | Hashrate | Bruit | Taille de pièce | Prix (CAD) |
|---|---|---|---|---|---|---|
| S9 Space Heater | 1,400W | 4,777 | 13 TH/s | ~45 dB | 150–250 sq ft | $235 |
| L3+ Space Heater | 800W | 2,730 | 504 MH/s | ~40 dB | 80–150 sq ft | $295 |
| S17 Space Heater | 1,000W | 3,412 | 33 TH/s | ~45 dB | 100–200 sq ft | $530 |
| S19 Space Heater | 3,250W | 11,089 | 56 TH/s | ~40 dB | 350–600 sq ft | $755 |
| Slim Edition | 900W | 3,071 | 35 TH/s | ~35 dB | 100–175 sq ft | $560 |
| Loki Edition | 1,150W | 3,924 | 48 TH/s | ~40 dB | 120–225 sq ft | $585 |
| L7 Pivotal | 1,300W | 4,436 | 3.5 GH/s | ~40 dB | 140–250 sq ft | $2,350 |
| StealthMiner | 900W | 3,071 | 35 TH/s | ~35 dB | 100–175 sq ft | $850 |
| BitChimney | 800W | 2,730 | 504 MH/s | ~35 dB | 80–150 sq ft | $540 |
Tous les modèles incluent des ventilateurs silencieux (Noctua ou Arctic P14 Max), un firmware optimisé et un boîtier imprimé en 3D. Toutes les unités sont assemblées et testées dans l’installation de D-Central à Laval, Québec. Prix en CAD. Parcourir la collection complète.
Foire aux questions
Un mineur Bitcoin chauffe-t-il vraiment autant qu’une chaufferette ordinaire ?
Yes. This is physics, not marketing. A 1,400-watt device produces 1,400 watts of heat regardless of whether it is a ceramic heating element or a Bitcoin ASIC chip. The first law of thermodynamics guarantees that all electrical energy consumed by any device ultimately converts to thermal energy. A Bitcoin miner at 1,400W produces exactly 4,777 BTU/hr of heat — identical to a 1,400W electric space heater. The only difference is that the miner is also performing useful computational work (mining Bitcoin) while generating that heat.
Quel est le niveau sonore des éditions Chaufferette de D-Central ?
Standard ASIC miners use industrial fans that can reach 75–85 dB (louder than a vacuum cleaner). D-Central replaces these with premium silent fans — Noctua NF-A14 or Arctic P14 Max — bringing noise levels down to 35–45 dB depending on the model. For reference, a typical refrigerator runs at about 40 dB, and a quiet conversation is about 50 dB. Our Slim Edition and StealthMiner models are the quietest at approximately 35 dB. With optimized firmware, you can further reduce fan speed (and noise) by lowering the hashrate/wattage.
Combien de Bitcoin vais-je réellement gagner ?
Mining revenue depends on several variables: your miner’s hashrate, current network difficulty, Bitcoin price, and your mining pool’s fee structure. The estimates in this calculator use current network conditions and should be treated as approximations. At today’s difficulty, an S9 at 13 TH/s will earn a modest amount of sats daily — think of it as a discount on your heating bill rather than a profit center. The S19 at 56 TH/s earns proportionally more. The key insight is that you are spending this electricity on heating regardless; the Bitcoin is a bonus that reduces your effective heating cost. Over a full Canadian winter (5–7 months of heating), those sats accumulate. And if Bitcoin’s price appreciates over time, those sats become worth more in hindsight.
Puis-je brancher une chaufferette sur une prise domestique standard 120V/15A ?
Most of our models run on standard North American 120V outlets. The S9 (1,400W), S17 (1,000W), Slim Edition (900W), Loki Edition (1,150W), L3+ (800W), and BitChimney (800W) all draw under 1,500W and work on a standard 15A circuit. The S19 Space Heater Edition at 3,250W requires a 240V/20A outlet (like a dryer or oven outlet) — similar to what a large window AC unit or baseboard heater uses. We include the appropriate power supply and cable with every order. If you are unsure about your electrical setup, our consulting team can help you plan.
Que se passe-t-il en été quand je n’ai pas besoin de chaleur ?
You have several options. Many customers vent the hot air outside using a window adapter or dryer vent duct — similar to a portable AC unit’s exhaust. Some move the miner to a garage or basement. Others simply turn it off for the summer months and run it only during the heating season (October through April in most of Canada). With optimized firmware, you can also reduce wattage significantly, lowering both heat output and power consumption while still earning some Bitcoin. D-Central also sells shrouds and duct adapters specifically designed for venting ASIC exhaust.
Est-ce que ça vaut la peine comparé à une thermopompe ou une fournaise au gaz naturel ?
A Bitcoin space heater is an electric resistance heater — the same category as baseboard heaters, ceramic heaters, and oil-filled radiators. It produces 1 watt of heat per 1 watt of electricity (COP of 1.0). Heat pumps achieve COP ratings of 2.0–4.0, meaning they move 2–4 watts of heat per watt of electricity. So a heat pump is more energy-efficient for primary whole-home heating. A Bitcoin space heater is best used as supplemental or zone heating — warming the room you are in, heating a basement, garage, or workshop, or replacing an existing electric space heater. If you are already using electric resistance heating (baseboard, portable heater, in-floor electric), a Bitcoin space heater is a direct replacement at zero additional energy cost, with the bonus of mining Bitcoin. Think of it as upgrading your existing electric heater, not replacing your furnace.
Transformez votre facture de chauffage en Bitcoin
Vous allez dépenser cette électricité pour le chauffage de toute façon. Faites-la miner du Bitcoin. D-Central est le pionnier des chaufferettes Bitcoin depuis 2016, chaque unité étant assemblée et testée dans notre installation à Laval, Québec.
Besoin d’aide pour choisir ? Réservez une consultation gratuite ou appelez le 1-855-753-9997.
‘;
html += ‘‘ + badgeText + ‘‘;
html += ‘‘;
html += ‘
‘;
container.innerHTML += html;
});
// Always add Bitaxe as supplemental note
var bx = MODELS.bitaxe;
var bxCov = (bx.btu / btuNeeded) * 100;
container.innerHTML += ‘‘;
html += ‘Power‘ + formatNum(m.watts) + ‘W‘;
html += ‘BTU/hr‘ + formatNum(m.btu) + ‘‘;
html += ‘Hashrate‘ + m.hash + ‘ ‘ + m.hashUnit + ‘‘;
html += ‘Noise~’ + m.noise + ‘ dB‘;
html += ‘Price$’ + formatNum(m.price) + ‘ CAD‘;
html += ‘
‘;
var covColor = cov >= 90 ? ‘var(–green)’ : (cov >= 60 ? ‘var(–accent)’ : ‘var(–yellow)’);
html += ‘‘;
html += ‘Couvre ‘ + Math.round(cov) + ‘% de vos besoins de chauffage’;
if (cov > 120) html += ‘ (chaleur excédentaire)’;
html += ‘
‘;
html += ‘‘ +
‘Supplemental‘ +
‘‘ +
‘
‘;
}
// —– Main calculation —–
window.calculate = function() {
// — Read inputs —
var length = val(‘roomLength’);
var width = val(‘roomWidth’);
var height = val(‘roomHeight’);
var insulation = $(‘insulation’).value;
var indoorTemp = val(‘indoorTemp’);
var outdoorTemp = val(‘outdoorTemp’);
var numUnits = Math.max(1, Math.round(val(‘numUnits’)));
var hoursPerDay = Math.max(1, Math.min(24, Math.round(val(‘hoursPerDay’))));
var rate = getRate();
// Update rate display
setText(‘rateVal’, ‘$’ + rate.toFixed(4) + ‘/kWh’);
// — Convert dimensions to feet —
var lengthFt = state.dimUnit === ‘m’ ? mToFt(length) : length;
var widthFt = state.dimUnit === ‘m’ ? mToFt(width) : width;
var heightFt = state.dimUnit === ‘m’ ? mToFt(height) : height;
// — Convert temps to F —
var indoorF = state.tempUnit === ‘C’ ? cToF(indoorTemp) : indoorTemp;
var outdoorF = state.tempUnit === ‘C’ ? cToF(outdoorTemp) : outdoorTemp;
// — Calculate room —
var sqft = lengthFt * widthFt;
var volume = sqft * heightFt;
var tempDelta = indoorF – outdoorF;
// BTU/hr calculation:
// Base formula: BTU = sqft * tempDelta * insulation_factor * height_factor
// Height factor adjusts for ceilings above 8ft
var heightFactor = heightFt > 8 ? (heightFt / 8) : 1;
var insFactor = INSULATION[insulation].factor;
var btuNeeded = sqft * tempDelta * insFactor * heightFactor;
// Ensure non-negative
if (btuNeeded 0 && width > 0 && height > 0;
if (hasRoom) {
show(‘results1’);
setText(‘btuNeeded’, formatNum(Math.round(btuNeeded)));
setText(‘wattsNeeded’, formatNum(Math.round(wattsNeeded)) + ‘W’);
var volUnit = state.dimUnit === ‘m’ ? ‘ mu00B3’ : ‘ ftu00B3’;
var areaUnit = state.dimUnit === ‘m’ ? ‘ mu00B2’ : ‘ sq ft’;
var displayArea = state.dimUnit === ‘m’ ? (length * width) : sqft;
var displayVol = state.dimUnit === ‘m’ ? (length * width * height) : volume;
setText(‘roomVolume’, formatNum(Math.round(displayVol)) + volUnit);
setText(‘roomAreaNote’, formatNum(Math.round(displayArea)) + areaUnit + ‘ de surface au sol’);
buildRecommendations(btuNeeded);
} else {
hide(‘results1’);
}
// — Miner data —
var miner = getMinerData();
var totalWatts = miner.watts * numUnits;
var totalBtu = totalWatts * 3.412;
var totalHash = miner.hash * numUnits;
var hasMiner = totalWatts > 0;
if (hasMiner) {
show(‘results2’);
setText(‘totalBtu’, formatNum(Math.round(totalBtu)) + ‘ BTU/hr’);
setText(‘totalWatts’, formatNum(Math.round(totalWatts)) + ‘W’);
var hashDisplay = totalHash;
var hashUnitDisplay = miner.hashUnit;
// Convert if large
if (miner.hashUnit === ‘TH/s’ && totalHash >= 1000) {
hashDisplay = totalHash / 1000;
hashUnitDisplay = ‘PH/s’;
}
if (typeof hashDisplay === ‘number’ && hashDisplay % 1 !== 0) {
setText(‘totalHash’, hashDisplay.toFixed(1) + ‘ ‘ + hashUnitDisplay);
} else {
setText(‘totalHash’, formatNum(hashDisplay) + ‘ ‘ + hashUnitDisplay);
}
setText(‘hashAlgo’, miner.algo);
} else {
hide(‘results2’);
}
// — Coverage —
if (hasRoom && hasMiner && btuNeeded > 0) {
show(‘coverageSection’);
var coverage = (totalBtu / btuNeeded) * 100;
var covDisplay = Math.round(coverage);
var barWidth = Math.min(coverage, 130);
var covPctEl = $(‘coveragePct’);
covPctEl.textContent = covDisplay + ‘%’;
var bar = $(‘coverageBar’);
bar.style.width = Math.min(barWidth, 100) + ‘%’;
var msgEl = $(‘coverageMsg’);
if (coverage >= 110) {
bar.style.background = ‘linear-gradient(90deg, var(–accent), #ff9a44)’;
covPctEl.style.color = ‘var(–accent)’;
msgEl.className = ‘btu-calc__coverage-msg status-over’;
msgEl.innerHTML = ‘ Cette configuration dépasse vos besoins de chauffage de ‘ + (covDisplay – 100) + ‘%. Vous pouvez réduire la puissance via le firmware, diminuer le nombre d’unités, ou évacuer l’excès de chaleur. Le firmware optimisé (BraiinsOS+) vous permet d’ajuster la puissance exacte dont vous avez besoin.‘;
} else if (coverage >= 90) {
bar.style.background = ‘linear-gradient(90deg, var(–green), #34d399)’;
covPctEl.style.color = ‘var(–green)’;
msgEl.className = ‘btu-calc__coverage-msg status-good’;
msgEl.innerHTML = ‘ Excellente couverture. Cette configuration chauffera confortablement votre pièce tout en minant du Bitcoin. Un ajustement quasi parfait pour votre espace.‘;
} else if (coverage >= 60) {
bar.style.background = ‘linear-gradient(90deg, var(–yellow), var(–accent))’;
covPctEl.style.color = ‘var(–yellow)’;
msgEl.className = ‘btu-calc__coverage-msg status-warn’;
msgEl.innerHTML = ‘ Couverture partielle. Ce mineur réchauffera votre pièce de manière perceptible mais pourrait ne pas remplacer entièrement votre chaufferette actuelle par froid extrême. Envisagez d’ajouter une deuxième unité ou de choisir un modèle de puissance supérieure.‘;
} else {
bar.style.background = ‘linear-gradient(90deg, var(–red), #f87171)’;
covPctEl.style.color = ‘var(–red)’;
msgEl.className = ‘btu-calc__coverage-msg status-low’;
msgEl.innerHTML = ‘ Ce modèle ne couvre que ‘ + covDisplay + ‘% des besoins de chauffage de votre pièce. Vous aurez besoin d’un chauffage supplémentaire, de plusieurs unités, ou d’un modèle de puissance supérieure comme le S19 Space Heater Edition (11 089 BTU/h).‘;
}
} else {
hide(‘coverageSection’);
}
// — Cost Comparison —
if (hasMiner) {
show(‘costResults’);
// Monthly electricity cost
var kWhPerDay = (totalWatts / 1000) * hoursPerDay;
var monthlyKWh = kWhPerDay * 30.44;
var monthlyElecCost = monthlyKWh * rate;
// Mining revenue
var dailyBtcCad = 0;
if (miner.algo === ‘SHA-256’) {
var hashTHs = 0;
if (miner.hashUnit === ‘TH/s’) hashTHs = totalHash;
else if (miner.hashUnit === ‘GH/s’) hashTHs = totalHash / 1000;
else if (miner.hashUnit === ‘MH/s’) hashTHs = totalHash / 1e6;
var dailyBtc = estimateBtcPerDay(hashTHs);
dailyBtcCad = dailyBtc * state.btcPrice;
var dailySats = Math.round(dailyBtc * 1e8);
var monthlyBtc = dailyBtc * 30.44;
setText(‘btcMined’, (monthlyBtc * 1e8).toFixed(0).replace(/B(?=(d{3})+(?!d))/g, ‘,’) + ‘ sats’);
setText(‘btcMinedSats’, formatNum(dailySats) + ‘ sats/day’);
} else {
// Scrypt
dailyBtcCad = estimateScryptCadPerDay(totalWatts);
var monthlyScrCad = dailyBtcCad * 30.44;
setText(‘btcMined’, formatCurrency(monthlyScrCad));
setText(‘btcMinedSats’, formatCurrency(dailyBtcCad) + ‘/day (LTC+DOGE)’);
}
// Adjust revenue for hours (if not 24h, scale down)
var revenueScale = hoursPerDay / 24;
dailyBtcCad = dailyBtcCad * revenueScale;
var monthlyRevenue = dailyBtcCad * 30.44;
// Recalculate sats display with hours scaling
if (miner.algo === ‘SHA-256’) {
var hashTHs2 = 0;
if (miner.hashUnit === ‘TH/s’) hashTHs2 = totalHash;
else if (miner.hashUnit === ‘GH/s’) hashTHs2 = totalHash / 1000;
var dailyBtcAdj = estimateBtcPerDay(hashTHs2) * revenueScale;
var monthlyBtcAdj = dailyBtcAdj * 30.44;
var dailySatsAdj = Math.round(dailyBtcAdj * 1e8);
setText(‘btcMined’, formatNum(Math.round(monthlyBtcAdj * 1e8)) + ‘ sats’);
setText(‘btcMinedSats’, formatNum(dailySatsAdj) + ‘ sats/day’);
monthlyRevenue = monthlyBtcAdj * state.btcPrice;
} else {
var dailyScryptAdj = estimateScryptCadPerDay(totalWatts) * revenueScale;
monthlyRevenue = dailyScryptAdj * 30.44;
setText(‘btcMined’, formatCurrency(monthlyRevenue));
setText(‘btcMinedSats’, formatCurrency(dailyScryptAdj) + ‘/day (LTC+DOGE est.)’);
}
var effectiveMonthlyCost = monthlyElecCost – monthlyRevenue;
var annualSavingsVal = monthlyRevenue * 12;
// Update cost cards
setText(‘elecCost’, formatCurrency(monthlyElecCost));
setText(‘miningRevenue’, ‘+’ + formatCurrency(monthlyRevenue));
$(‘effectiveCost’).textContent = formatCurrency(effectiveMonthlyCost);
$(‘effectiveCost’).style.color = effectiveMonthlyCost < monthlyElecCost ? 'var(–green)' : 'var(–text-primary)';
// Comparison cards
setText('compTradBtu', formatNum(Math.round(totalBtu)) + ' BTU/hr');
setText('compTradWatts', formatNum(Math.round(totalWatts)) + 'W');
setText('compTradCost', formatCurrency(monthlyElecCost));
setText('compTradNet', formatCurrency(monthlyElecCost));
var modelLabel = miner.key !== 'custom' ? miner.name : 'Mineur personnalisé';
setText('compMinerTitle', modelLabel);
setText('compMinerBtu', formatNum(Math.round(totalBtu)) + ' BTU/hr');
setText('compMinerWatts', formatNum(Math.round(totalWatts)) + 'W');
setText('compMinerCost', formatCurrency(monthlyElecCost));
setText('compMinerBtc', '+' + formatCurrency(monthlyRevenue));
setText('compMinerNet', formatCurrency(effectiveMonthlyCost));
// Annual savings
setText('annualSavings', formatCurrency(annualSavingsVal));
var note = 'Même production de chaleur. Même consommation d'u00e9lectricité. Mais votre chaufferette est aussi un mineur Bitcoin qui accumule des sats. ';
if (miner.algo === 'SHA-256') {
note += 'Estimations basées sur le prix actuel du BTC (' + formatCurrency(state.btcPrice) + ' CAD) et la difficulté du réseau. ';
} else {
note += 'Le revenu de minage Scrypt est une estimation approximative basée sur les conditions actuelles du marché. ';
}
note += 'Les résultats réels varieront selon les conditions du marché, les ajustements de difficulté et le temps de fonctionnement.';
if (!state.btcPriceLoaded) {
note += ' (Using fallback BTC price — live price could not be fetched.)';
}
setText('savingsNote', note);
} else {
hide('costResults');
}
};
// —– Initialize —–
function init() {
fetchBtcData();
updateOutdoorTemp();
// Set initial temp unit display (default is F)
state.tempUnit = 'F';
var tempBtns = $('tempUnitToggle').querySelectorAll('.btu-calc__unit-btn');
tempBtns.forEach(function(b) { b.classList.toggle('active', b.getAttribute('data-unit') === 'F'); });
// Set initial dim unit (default ft)
state.dimUnit = 'ft';
// Run initial calc (will show nothing until inputs are filled)
calculate();
}
// Run on DOM ready
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
})();
‘ +
‘Power~25W‘ +
‘BTU/hr~85‘ +
‘Coverage‘ + bxCov.toFixed(1) + ‘%‘ +
‘
‘ +
‘Billet de loterie de minage solo — pas une chaufferette principale. Combinez avec une édition Chaufferette pour le meilleur des deux mondes.
‘ +
‘Un mineur Bitcoin chauffe-t-il vraiment autant qu’une chaufferette ordinaire ?
Yes. This is physics, not marketing. A 1,400-watt device produces 1,400 watts of heat regardless of whether it is a ceramic heating element or a Bitcoin ASIC chip. The first law of thermodynamics guarantees that all electrical energy consumed by any device ultimately converts to thermal energy. A Bitcoin miner at 1,400W produces exactly 4,777 BTU/hr of heat — identical to a 1,400W electric space heater. The only difference is that the miner is also performing useful computational work…
Quel est le niveau sonore des éditions Chaufferette de D-Central ?
Standard ASIC miners use industrial fans that can reach 75–85 dB (louder than a vacuum cleaner). D-Central replaces these with premium silent fans — Noctua NF-A14 or Arctic P14 Max — bringing noise levels down to 35–45 dB depending on the model. For reference, a typical refrigerator runs at about 40 dB, and a quiet conversation is about 50 dB. Our Slim Edition and StealthMiner models are the quietest at approximately 35 dB. With optimized firmware, you can further…
Combien de Bitcoin vais-je réellement gagner ?
Mining revenue depends on several variables: your miner’s hashrate, current network difficulty, Bitcoin price, and your mining pool’s fee structure. The estimates in this calculator use current network conditions and should be treated as approximations. At today’s difficulty, an S9 at 13 TH/s will earn a modest amount of sats daily — think of it as a discount on your heating bill rather than a profit center. The S19 at 56 TH/s earns proportionally more. The key insight is that you are…
Puis-je brancher une chaufferette sur une prise domestique standard 120V/15A ?
Most of our models run on standard North American 120V outlets. The S9 (1,400W), S17 (1,000W), Slim Edition (900W), Loki Edition (1,150W), L3+ (800W), and BitChimney (800W) all draw under 1,500W and work on a standard 15A circuit. The S19 Space Heater Edition at 3,250W requires a 240V/20A outlet (like a dryer or oven outlet) — similar to what a large window AC unit or baseboard heater uses. We include the appropriate power supply and cable with every order. If you are unsure about your…
Que se passe-t-il en été quand je n’ai pas besoin de chaleur ?
You have several options. Many customers vent the hot air outside using a window adapter or dryer vent duct — similar to a portable AC unit’s exhaust. Some move the miner to a garage or basement. Others simply turn it off for the summer months and run it only during the heating season (October through April in most of Canada). With optimized firmware, you can also reduce wattage significantly, lowering both heat output and power consumption while still earning some Bitcoin. D-Central…
Est-ce que ça vaut la peine comparé à une thermopompe ou une fournaise au gaz naturel ?
A Bitcoin space heater is an electric resistance heater — the same category as baseboard heaters, ceramic heaters, and oil-filled radiators. It produces 1 watt of heat per 1 watt of electricity (COP of 1.0). Heat pumps achieve COP ratings of 2.0–4.0, meaning they move 2–4 watts of heat per watt of electricity. So a heat pump is more energy-efficient for primary whole-home heating. A Bitcoin space heater is best used as supplemental or zone heating — warming the room…