BW L21
Heater-Class Miner
At 950W, this miner outputs approximately 3241 BTU/hr of heat — equivalent to a standard electric space heater. Every watt consumed by an ASIC miner is converted to heat with 100% efficiency, making it a space heater that also mines Bitcoin.
During heating season, the electricity cost of running this miner replaces your heating bill — and you earn Bitcoin on top. In cold climates like Canada, this dual-purpose approach can dramatically improve mining economics. D-Central offers purpose-built Bitcoin Space Heater editions with noise reduction, duct adapters, and heater-mode firmware for seamless home integration.
Profitability Calculator
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $0.00 | $1.60 | $-1.60 |
| Weekly | $0.00 | $11.17 | $-11.17 |
| Monthly | $0.00 | $47.88 | $-47.88 |
| Yearly | $0.01 | $582.54 | $-582.53 |
Heating offset estimates the value of heat replacing an electric space heater during heating season (~6 months/year in Canada). Actual savings depend on your heating setup and climate.
Where to Buy the BW L21
D-Central Technologies is a Bitcoin-only company. For this miner, check out our trusted partner retailers below.
ASIC Miner Market
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Full Specifications
| Model | BW L21 |
| Model Number | L21 |
| Manufacturer | BW |
| Algorithm | Scrypt |
| Coins Mined | Litecoin (LTC), Dogecoin (DOGE) |
| Hashrate | 550 MH/s |
| Power Consumption | 950 W |
| Efficiency | 1727272.7 J/TH |
| Dimensions | 130 x 155 x 350mm |
| Weight | 5750 |
| BTU Output | 3241 BTU/hr |
| Equivalent Heater | Half a standard space heater (3,241 BTU/hr) |
| Daily Power Cost | $1.60/day |
| Monthly Power Cost | $47.88/mo |
| Circuit Requirement | Standard 120V 15A |
| Release Date | 2018-01-01 |
| Status | Active |
Home Mining Assessment
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Goldshell MINI DOGE III PLUS
Frequently Asked Questions
Is the BW L21 profitable?
At $0.07/kWh, the BW L21 currently operates at a daily loss of $1.60. However, profitability can improve with lower electricity rates or rising BTC prices. If used as a space heater, the heating offset may make it economically viable.
Can I mine Bitcoin at home with the BW L21?
The BW L21 has a home mining score of 31/100. With 0 dB noise and 950W power draw, it may require a dedicated space like a garage, basement, or outdoor enclosure. Consider noise insulation and proper ventilation.
Can the BW L21 heat my home?
The BW L21 outputs approximately 3241 BTU/hr of heat. For reference, a typical space heater produces 5,000-5,500 BTU/hr. All electrical energy consumed by the miner is converted to heat, making it 100% efficient as a heater. D-Central offers Bitcoin Space Heater builds designed specifically for home heating integration.
What power supply does the BW L21 need?
The BW L21 draws 950W of power. You need a power supply rated for at least 1,045W with appropriate voltage (200-240V AC). D-Central stocks compatible power supplies in our shop. Always use a quality PSU from a reputable manufacturer to protect your investment.