Mining-as-Heating Savings Calculator: Is Your Bitcoin Miner a Free Space Heater?
A Bitcoin ASIC turns ~100% of its power into heat. Calculate the heating-bill offset and your effective winter mining cost by fuel type.
Quick answer
A Bitcoin ASIC converts essentially 100% of the electricity it draws into heat. If you already heat your space with electric resistance, running a 3,000 W miner during the heating season costs you almost nothing extra — the ~72 kWh/day it uses would have been spent on baseboard heat anyway, so your effective mining electricity cost in winter is near $0/kWh and the bitcoin it earns is a bonus. With a heat pump or gas, the miner is pricier heat, so the math depends on your fuel.
The honest rule: mining-as-heating only "pays for itself" against electric-resistance heat (1:1). Against an efficient heat pump or cheap gas it costs more per unit of heat — the calculator shows your real number.
Method: An ASIC is a ~100%-efficient resistive heater: every kWh it draws becomes ~1 kWh of heat. During heating season that heat offsets heat you would otherwise buy. The offset value per kWh of mining electricity equals your heating cost per kWh-thermal — for electric resistance that equals your electricity rate (so net winter cost ≈ $0); for a heat-pump it's your rate ÷ COP (the pump makes ~3 kWh heat per kWh, so mining heat is ~3× pricier); for gas/propane/oil it's that fuel's per-kWh cost. Outside heating season there is no offset. Estimates only — not financial advice. See the heat-reuse glossary entry and D-Central's Bitcoin space heaters.
Related products, repair, and setup paths
- immersion cooling hub
- home immersion cooling guide
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- compare miner specs in the database
- ASIC repair support
Last reviewed June 19, 2026.