Definition
Heat reuse (or waste-heat recovery) is the practice of capturing the thermal energy a Bitcoin miner produces and putting it to productive use instead of dumping it outdoors. Virtually 100% of the electricity an ASIC consumes is converted to heat, so every watt spent hashing can do double duty if that heat is directed into a space, a water loop, or an industrial process that needs warmth.
Air vs. Liquid Capture
Air-cooled ASICs exhaust at roughly 50-70°C, which is well suited to space heating and pre-heating ventilation air through ducting. Liquid- and immersion-cooled rigs deliver coolant at around 40-55°C and can capture a much larger share of the heat — immersion setups recover up to ~96% — making them ideal for domestic hot water, radiant floor heating, greenhouses, and district heating loops via a heat exchanger.
Why It Changes the Economics
If you already heat a space with electricity or gas, a mining heater offsets that heating bill while earning Bitcoin, effectively lowering the net cost of hashing. This reframes miner heat from a datacenter liability into useful infrastructure — the foundation of purpose-built Bitcoin space heaters that drop into residential HVAC.
Heat reuse is central to home mining economics. See how it works in practice with D-Central's Bitcoin space heaters and the guide to repurposing excess miner heat.
In Simple Terms
Heat reuse (or waste-heat recovery) is the practice of capturing the thermal energy a Bitcoin miner produces and putting it to productive use instead of…