{"meta":{"title":"D-Central \u2014 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":"2026-08-09T15:58:44+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 \u2014 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 SHA-256 is obsolete for profit \u2014 run it for the heat.","source":"wall_w: D-Central ASIC power-requirements dataset; noise: dc_miner noise_level meta; BTU derived (W x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 \u2014 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 \u2014 enough for a ~325 ft2 space \u2014 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 \u2014 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 \u2014 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 \u2014 silent desk miner)","home_fit_verdict":"NOT a heater: ~18 W is ~61 BTU\/h \u2014 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."}]}