{
    "meta": {
        "title": "D-Central — ASIC Space-Heater Suitability & Heat-Reuse Profiles",
        "description": "Heat-reuse decision data for 8 Bitcoin ASIC miners run as space heaters: wall watts, thermal BTU/h and kW, a caveated heated-area heuristic, stock noise (dBA), an airflow estimate, and the best heat-reuse application (forced-air garage / ducted whole-room / immersion->hydronic / not-for-living-space) with a plain home-fit verdict.",
        "generated": "2026-06-23T18:44:48+00:00",
        "version": "1.0",
        "license": "https://creativecommons.org/licenses/by/4.0/",
        "license_name": "CC BY 4.0",
        "source": "https://d-central.tech/bitcoin-space-heater-specs/",
        "record_count": 8,
        "method": "heat_btu_h = wall_w x 3.412142 (an ASIC converts ~100% of wall power to heat). heat_kw_thermal = wall_w / 1000.",
        "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating.",
        "provenance": "wall_w aligned with the D-Central ASIC power-requirements dataset / Mining Bible (MINING_ECOSYSTEM); noise_dba_stock PULLED from the dc_miner noise_level meta (stock fans, full load), not recomputed; airflow_cfm_estimate is an engineering estimate FLAGGED unverified on every row (Bitmain does not publish stock-fan CFM; Bible KNOWLEDGE_GAPS_EE 4.3 lists fan airflow as an open gap).",
        "disclaimer": "Heated-area is a sizing heuristic, not a manufacturer rating. Stock Antminers are 75-76 dBA (too loud for a living space) and need a 240V circuit; treat these as garage/ducted/immersion appliances. SHA-256 ASICs are rarely profitable to run for hashes alone — the value here is the heat."
    },
    "rows": [
        {
            "id": "s9",
            "model": "Antminer S9 / S9i",
            "wall_w": 1400,
            "fan_config": "dual 120mm",
            "airflow_cfm_estimate": "~600",
            "airflow_verified": false,
            "best_reuse_application": "forced-air garage / workshop (or immersion->hydronic)",
            "home_fit_verdict": "The classic DIY heater base: lowest BTU here (~4,777 BTU/h) suits a small room, but 76 dBA stock fans are too loud for a living space. Duct it, swap to quiet fans, or keep it in the garage/shop. SHA-256 is obsolete for profit — run it for the heat.",
            "source": "wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived (W x 3.412142). Bible: MINING_ECOSYSTEM, KNOWLEDGE_GAPS_EE 4.3 (fan airflow gap).",
            "heat_btu_h": 4777,
            "heat_kw_thermal": 1.399999999999999911182158029987476766109466552734375,
            "heated_area_sqft_heuristic": 140,
            "noise_dba_stock": 76,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "l3plus",
            "model": "Antminer L3+",
            "wall_w": 800,
            "fan_config": "dual 120mm",
            "airflow_cfm_estimate": "~600",
            "airflow_verified": false,
            "best_reuse_application": "forced-air garage / workshop (or ducted whole-room)",
            "home_fit_verdict": "Lowest power here (800 W, ~2,730 BTU/h) makes it the gentlest single-room contributor, but 75 dBA stock means duct it out of earshot or fit quiet fans. Scrypt/Litecoin, not Bitcoin.",
            "source": "wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 2729.6999999999998181010596454143524169921875,
            "heat_kw_thermal": 0.8000000000000000444089209850062616169452667236328125,
            "heated_area_sqft_heuristic": 80,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "s17-t17-uc",
            "model": "Antminer S17 / T17 (underclocked)",
            "wall_w": 1800,
            "fan_config": "quad 120mm",
            "airflow_cfm_estimate": "~750",
            "airflow_verified": false,
            "best_reuse_application": "ducted whole-room (or forced-air garage)",
            "home_fit_verdict": "Underclocked to ~1,800 W (stock S17/T17 pulls 2,200-2,520 W) it lands near ~6,142 BTU/h with lower fan speed and somewhat less noise than full tilt — but still 75 dBA stock. Best ducted; these boards are also failure-prone, so treat as a heat appliance, not an investment.",
            "source": "wall_w: underclocked target (stock S17/T17 2,200-2,520 W, MINING_ECOSYSTEM); noise: dc_miner noise_level meta (stock); BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 6141.899999999999636202119290828704833984375,
            "heat_kw_thermal": 1.8000000000000000444089209850062616169452667236328125,
            "heated_area_sqft_heuristic": 180,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "s19-pro",
            "model": "Antminer S19 Pro",
            "wall_w": 3250,
            "fan_config": "quad 120mm",
            "airflow_cfm_estimate": "~750",
            "airflow_verified": false,
            "best_reuse_application": "ducted whole-room (or immersion->hydronic)",
            "home_fit_verdict": "A serious furnace at ~11,089 BTU/h — enough for a ~325 ft2 space — but 75 dBA and a 240V circuit put it firmly out of the living room. Duct the exhaust into the room and keep the unit elsewhere, or go immersion for hydronic reuse.",
            "source": "wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 11089.5,
            "heat_kw_thermal": 3.25,
            "heated_area_sqft_heuristic": 325,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "s19j-pro",
            "model": "Antminer S19j Pro",
            "wall_w": 3050,
            "fan_config": "quad 120mm",
            "airflow_cfm_estimate": "~750",
            "airflow_verified": false,
            "best_reuse_application": "ducted whole-room (or immersion->hydronic)",
            "home_fit_verdict": "~10,407 BTU/h covers a ~305 ft2 room. Same story as the S19 Pro: 75 dBA and 240V mean duct it or run it in a garage/utility space, not a bedroom.",
            "source": "wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 10407,
            "heat_kw_thermal": 3.04999999999999982236431605997495353221893310546875,
            "heated_area_sqft_heuristic": 305,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "t19",
            "model": "Antminer T19",
            "wall_w": 3150,
            "fan_config": "quad 120mm",
            "airflow_cfm_estimate": "~750",
            "airflow_verified": false,
            "best_reuse_application": "ducted whole-room (or forced-air garage)",
            "home_fit_verdict": "~10,748 BTU/h, ~315 ft2. The T19 trades efficiency for a lower entry price, which makes it a popular heat-first pick — still 75 dBA, still 240V, still duct-or-garage.",
            "source": "wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 10748.20000000000072759576141834259033203125,
            "heat_kw_thermal": 3.149999999999999911182158029987476766109466552734375,
            "heated_area_sqft_heuristic": 315,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "s21",
            "model": "Antminer S21",
            "wall_w": 3500,
            "fan_config": "quad 120mm",
            "airflow_cfm_estimate": "~750",
            "airflow_verified": false,
            "best_reuse_application": "immersion->hydronic (or ducted whole-room)",
            "home_fit_verdict": "Highest air-cooled BTU here (~11,942 BTU/h, ~350 ft2) AND the best efficiency, so it earns its electricity longest. At 3,500 W / 240V / 75 dBA the smart home play is an immersion tank feeding a hydronic loop — heat without the jet-engine noise.",
            "source": "wall_w & 11,942 BTU/h: Bible MINING_ECOSYSTEM (S21 3500W table); noise: dc_miner noise_level meta; BTU derived. Bible: KNOWLEDGE_GAPS_EE 4.3.",
            "heat_btu_h": 11942.5,
            "heat_kw_thermal": 3.5,
            "heated_area_sqft_heuristic": 350,
            "noise_dba_stock": 75,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        },
        {
            "id": "bitaxe-gamma",
            "model": "Bitaxe Gamma (contrast row)",
            "wall_w": 18,
            "fan_config": "single 40-60mm",
            "airflow_cfm_estimate": "~20",
            "airflow_verified": false,
            "best_reuse_application": "not-for-living-space (negligible heat — silent desk miner)",
            "home_fit_verdict": "NOT a heater: ~18 W is ~61 BTU/h — a warm laptop, not a furnace. Listed only for contrast: at 38 dBA it is whisper-quiet and lives on a desk. If you want sovereign solo-mining without heating a room, this is the trade-off against the kilowatt-class Antminers above.",
            "source": "wall_w: typical Bitaxe Gamma (BM1370) draw; noise: dc_miner noise_level meta (38 dBA); BTU derived. Bible: ecosystem/open-source.",
            "heat_btu_h": 61.39999999999999857891452847979962825775146484375,
            "heat_kw_thermal": 0.0179999999999999986399767948341832379810512065887451171875,
            "heated_area_sqft_heuristic": 2,
            "noise_dba_stock": 38,
            "area_assumption": "Heated-area figures are a ROUGH heuristic at ~10 W/ft2 (~34 BTU/h.ft2): a moderately insulated modern space holding ~21C indoor against ~0C outdoor (roughly climate zone 5-6). HALVE the area for a poorly insulated room or a sub-zero climate; DOUBLE it for a mild climate or a tight, well-sealed envelope. Use it for sizing intuition, not as a manufacturer rating."
        }
    ]
}