{"meta":{"title":"D-Central \u2014 Home Heat-Reuse Application Compatibility Matrix","description":"Compatibility matrix of 8 home heating applications for reusing Bitcoin ASIC miner waste heat \u2014 feasibility, achievable temperature range, air-vs-immersion requirement, plumbing\/ducting complexity, BTU sizing rule-of-thumb and caveats per application.","generated":"2026-08-09T16:23:25+00:00","version":"1.0","license":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","license_name":"CC BY 4.0","source":"https:\/\/d-central.tech\/miner-heat-reuse-applications\/","record_count":8,"provenance":"Physical anchor: a Bitcoin ASIC is a ~100%-efficient resistive heater; 1 kW electrical \u2248 3,412 BTU\/h of heat. Per-application feasibility\/temperature\/complexity grounded in standard HVAC + hydronic engineering and D-Central heat-reuse, ventilation and immersion-cooling guidance.","disclaimer":"A PLANNING reference, NOT an engineering sign-off. Final sizing, fluid selection, potable\/electrical separation, permitting and installation must be done by a licensed mechanical\/electrical professional. Mining fluids and potable\/pool water must never mix; high-current electrical near water demands proper bonding and GFCI."},"rows":[{"id":"forced-air-space-heat","application":"Forced-air space heat (direct room exhaust)","feasibility":"High \u2014 the default, lowest-cost reuse","temp_range":"Exhaust air ~35\u201350 \u00b0C (95\u2013122 \u00b0F); typically 15\u201330 \u00b0C above room ambient","medium":"Air-cooled miner. Exhaust ducted or blown directly into the occupied room; no liquid loop.","complexity":"Low \u2014 a flexible duct \/ shroud and an intake filter. No plumbing.","btu_rule":"Heat output (BTU\/h) \u2248 miner watts \u00d7 3.412. A 3,000 W miner \u2248 10,200 BTU\/h \u2014 enough to heat roughly 300\u20131,000 sq ft depending on insulation and climate (\u224810 BTU\/h\u00b7ft\u00b2 mild, 30\u201340 BTU\/h\u00b7ft\u00b2 cold).","caveats":"Noise (70\u201375 dB raw) is the binding constraint indoors \u2014 needs acoustic shrouding\/box. Dry winter air; dust\/lint shed from the airstream. Provide outdoor makeup air. Never recirculate exhaust back through the intake.","source":"ASIC = ~100% resistive heater; 1 kW = 3,412 BTU\/h. D-Central heat-reuse + ventilation guidance.","last_verified":"2026-06"},{"id":"ducted-whole-room","application":"Ducted whole-room \/ whole-home (into HVAC)","feasibility":"Medium-High \u2014 works where ductwork and static-pressure budget allow","temp_range":"Delivered air ~30\u201345 \u00b0C (86\u2013113 \u00b0F) at registers after duct mixing\/loss","medium":"Air-cooled miner tied into supply\/return ductwork or a dedicated plenum; a bypass damper sheds heat outdoors in summer.","complexity":"Medium \u2014 sheet-metal transitions, a damper, and a booster fan sized to the duct static pressure. Often a mechanical permit.","btu_rule":"Same 3.412 \u00d7 watts. Two 3,400 W miners \u2248 23,000 BTU\/h \u2248 a small furnace stage. Do not exceed the duct's CFM\/static-pressure rating or you choke miner cooling.","caveats":"ASIC exhaust is cooler than furnace air, so it supplements rather than replaces a furnace. Add filtration to keep dust out of the duct system. Interlock a summer-bypass so you never push 10k+ BTU\/h into a cooled house. Code may require a listed transfer assembly.","source":"Heat balance from electrical draw; standard residential duct sizing. D-Central ventilation guide.","last_verified":"2026-06"},{"id":"immersion-hydronic-radiant","application":"Immersion \u2192 hydronic radiant (in-floor \/ panel)","feasibility":"High for LOW-temperature hydronic; the best match for immersion heat","temp_range":"Dielectric fluid ~45\u201365 \u00b0C (113\u2013149 \u00b0F); water loop ~40\u201355 \u00b0C after the heat exchanger \u2014 squarely in the low-temp radiant band (30\u201345 \u00b0C supply)","medium":"Single-phase immersion REQUIRED. Dielectric fluid \u2192 liquid-to-liquid (plate) heat exchanger \u2192 closed glycol\/water hydronic loop.","complexity":"High \u2014 dielectric tank, circulation pumps on both sides, plate heat exchanger, expansion tank, manifolds. Licensed hydronic install.","btu_rule":"3.412 \u00d7 watts of captured heat. A 10 kW immersion tank \u2248 34,000 BTU\/h \u2014 enough for ~800\u20131,500 ft\u00b2 of in-floor radiant; size the loop to deliver that at \u226445 \u00b0C supply.","caveats":"Low-temp radiant is the ideal sink because it WANTS the modest 40\u201355 \u00b0C immersion delivers; high-temp baseboard\/fan-coil will under-perform. Maintain dielectric fluid (dielectric oil or engineered fluid) and seals. Keep mining and potable\/hydronic fluids fully separated. Buffer tank smooths on\/off cycling.","source":"Single-phase immersion fluid temps; low-temp hydronic design band. D-Central immersion + heat-reuse guidance.","last_verified":"2026-06"},{"id":"dhw-preheat","application":"Domestic hot-water (DHW) PREHEAT","feasibility":"Medium \u2014 preheat only, never the sole water heater","temp_range":"Captured water ~40\u201355 \u00b0C (104\u2013131 \u00b0F): raises incoming cold mains, but below the 60 \u00b0C anti-Legionella \/ delivery target","medium":"Single-phase immersion preferred (steady fluid temp). Double-wall (potable-rated) heat exchanger \u2192 preheat tank feeding the real water heater.","complexity":"Medium-High \u2014 preheat tank, double-wall HX, tempering\/mixing valve, backflow protection. Plumbing permit; potable separation is mandatory.","btu_rule":"Heating water from 10 \u2192 50 \u00b0C needs \u2248 2.8 kWh per 60 L (16 US gal). A 3 kW miner's ~10,200 BTU\/h can preheat a household's daily draw, cutting the water-heater's run-time, not eliminating it.","caveats":"MUST use a double-wall heat exchanger and never let mining fluid contact potable water. The downstream heater MUST still reach 60 \u00b0C for Legionella control. Mixing\/tempering valve at the tap to prevent scald. Treat as energy recovery, not a code-compliant water heater.","source":"Water-heating energy (4.186 kJ\/kg\u00b7K); Legionella 60 \u00b0C guidance; potable double-wall HX requirement.","last_verified":"2026-06"},{"id":"greenhouse-grow","application":"Greenhouse \/ grow space","feasibility":"High \u2014 heat AND CO\u2082-free warmth where plants want 15\u201325 \u00b0C","temp_range":"Target air 15\u201327 \u00b0C (59\u201381 \u00b0F); ASIC exhaust easily holds a greenhouse above freezing on cold nights","medium":"Air-cooled (direct exhaust) is simplest; immersion \u2192 hydronic bench\/soil heat for finer control and humidity management.","complexity":"Low (air) to Medium (hydronic bench loop). Add a thermostat\/damper to vent surplus heat on sunny days.","btu_rule":"3.412 \u00d7 watts vs. the greenhouse heat-loss load (glazing U-value \u00d7 area \u00d7 \u0394T). A 3 kW miner \u2248 10,200 BTU\/h covers a small hobby greenhouse through most of a temperate winter night.","caveats":"Watch humidity \u2014 warm moving air dries plants; pair with humidity control. Filter dust off foliage. Provide fresh-air makeup. Over-temp venting needed for sunny days. Air exhaust adds NO CO\u2082 (electric, not combustion) \u2014 a plus over gas heaters.","source":"ASIC heat output vs greenhouse glazing heat-loss; horticultural setpoints.","last_verified":"2026-06"},{"id":"workshop-garage","application":"Workshop \/ garage \/ shop heat","feasibility":"High \u2014 noise-tolerant spaces are the sweet spot","temp_range":"Exhaust air ~35\u201350 \u00b0C (95\u2013122 \u00b0F); holds a shop at 12\u201320 \u00b0C in winter","medium":"Air-cooled, direct forced-air exhaust into the space. No liquid loop needed.","complexity":"Low \u2014 a shroud and an intake filter; optional thermostat-controlled bypass to outdoors.","btu_rule":"3.412 \u00d7 watts. A 3,400 W miner \u2248 11,600 BTU\/h \u2248 a small garage heater \u2014 comfortably warms a 1\u20132 car insulated garage. Add miners for larger\/leakier shops.","caveats":"Best home for raw ASIC noise (a shop tolerates 70+ dB). Keep the airstream away from combustibles, finishes and dust-sensitive work. Provide makeup air. Dust-prone shops need better intake filtration to protect the miner.","source":"ASIC heat output; typical garage\/shop heating loads.","last_verified":"2026-06"},{"id":"pool-spa","application":"Pool \/ spa \/ hot-tub heat","feasibility":"Medium-High \u2014 a large, forgiving thermal sink","temp_range":"Captured water 40\u201355 \u00b0C into the loop; pool target 26\u201329 \u00b0C (79\u201384 \u00b0F), spa 38\u201340 \u00b0C (100\u2013104 \u00b0F) \u2014 both within reach","medium":"Single-phase immersion \u2192 titanium\/cupronickel plate heat exchanger \u2192 pool\/spa circulation loop (corrosion-rated for chlorinated\/salt water).","complexity":"Medium-High \u2014 corrosion-resistant HX, pump tie-in, controls. Pool plumbing\/electrical permit; bonding\/GFCI critical near water.","btu_rule":"3.412 \u00d7 watts. Pools are huge sinks: a 5 kW miner \u2248 17,000 BTU\/h trims a pool heater's run-time and extends the swim season; a spa (small volume) can be largely miner-heated.","caveats":"Use a corrosion-rated heat exchanger (titanium for salt\/chlorine) \u2014 ordinary steel\/copper fails fast. Strict potable\/electrical separation and equipotential bonding near water. A large pool needs many kW to move the temperature; treat the miner as a heat-recovery booster, not a primary pool heater.","source":"ASIC heat output; pool\/spa setpoints; corrosion-rated HX practice.","last_verified":"2026-06"},{"id":"food-dehydration","application":"Food \/ lumber \/ produce dehydration","feasibility":"Low-Medium \u2014 possible, but food-safety and temperature limit it","temp_range":"Raw exhaust ~35\u201350 \u00b0C (95\u2013122 \u00b0F) suits low-temp drying (herbs, lumber, jerky cure 40\u201350 \u00b0C); most food drying wants 50\u201370 \u00b0C, the high end of what a miner delivers","medium":"Air-cooled exhaust through a CLEAN, FILTERED ductwork into a separate drying chamber \u2014 never the raw dusty airstream over food. Immersion-to-air HX gives controlled, particle-free heat.","complexity":"Medium \u2014 a sealed drying chamber, fine filtration (or an indirect air-to-air HX), and temperature control.","btu_rule":"3.412 \u00d7 watts of low-grade heat; ample airflow already present. Match chamber airflow to the load so humidity is carried off, not just heated.","caveats":"FOOD SAFETY: ASIC exhaust carries dust\/lint and trace outgassing \u2014 do NOT blow raw miner air directly over food. Use an indirect heat exchanger or heavy filtration. Temperature tops out near 50 \u00b0C, marginal for safe meat drying (which often needs 60 \u00b0C+). Lumber\/herb drying is the realistic use.","source":"ASIC exhaust temperature ceiling; dehydration setpoints; food-safety isolation requirement.","last_verified":"2026-06"}]}