A Bitcoin miner can heat a house. Whether it can pay for that heat is a different question.
A report published on November 9, 2026, described a 180-square-metre home in Nokia, Finland, that had disconnected from district heating and was relying entirely on a SunBit Bitcoin-mining boiler. The system turns electricity into heat while earning bitcoin. Its appeal rests on mining income covering the electricity bill—not on producing heat more efficiently than other appliances.
The report was written by CoinDesk’s Shaurya Malwa and translated into Chinese by Chopper at Foresight News. The figures below are reported examples and SunBit estimates, not guaranteed returns.
How the heating system works
Almost all the electricity used by the miner becomes heat. SunBit captures that heat in water, reaching temperatures of up to 60°C, and distributes it through radiators or underfloor pipes.
The homeowner owns the mining equipment, pays its electricity bill and keeps the bitcoin it earns, less any applicable fees. Because miners are noisy, the equipment generally sits in a basement or a separate soundproofed room.
SunBit CEO Elmeri Suomi told CoinDesk that the company delivered its first production systems in 2025. At the time of the report, 30 systems were operating, all but one in Finland. They were replacing or reducing the use of oil, gas, wood or district heating.
The installations varied. An old manor in Tampere used mining equipment to keep a 1,500-litre water tank between 50°C and 60°C. A 3,000-square-metre industrial building in Vimpeli combined mining-based heating with an air-source heat pump and surplus electricity from a 30-kilowatt solar array.
A worked example: revenue is not the same as payback
SunBit’s model for the Nokia home used a water-cooled Bitmain Antminer S21 XP Hydro rated at 495 TH/s, running Braiins OS firmware.
Its assumptions were:
- Continuous operation at about 5.3 kilowatts, consuming roughly 46,400 kilowatt-hours a year.
- Electricity costing $0.11 per kilowatt-hour, for an annual bill of about $5,200.
- Bitcoin priced at $82,000 and total network computing power of 1,040 EH/s.
- Annual production of approximately one-twelfth of a bitcoin.
Under those assumptions, SunBit estimated annual bitcoin revenue of about $6,100 after its optional 10% service fee. A further 0.5% mining-pool fee applied. The reported operating surplus was approximately $900 after electricity, before recovering the equipment’s purchase and installation cost.
The optional service included round-the-clock remote monitoring, adjustments for Finland’s variable electricity prices and a mobile app. Without that service, the model valued annual bitcoin production at about $6,800, before the pool fee.
These were estimates, not a record of what every household earned. Suomi supplied a pool-dashboard screenshot for one early customer using a different machine, a 358 TH/s S21+ Hydro. It showed production of 0.039 BTC over the preceding year, worth about $3,160 at the price cited in the report. That installation could replace approximately 2,000 litres of heating oil annually. SunBit said it could not see later customers’ private pool-account data.
The advantage comes from mining, not heating efficiency
A miner converts roughly one unit of electricity into one unit of heat. The report’s heat-pump comparison assumed 2.5–3 units of heat per unit of electricity, because a heat pump moves heat rather than simply generating it.
For a home needing 25,000 kilowatt-hours of heat annually, SunBit estimated an air-source heat pump’s yearly operating cost at about $1,100, against roughly $3,170 for district heating. Its mining model, run only long enough to supply that heating demand, projected a $490 surplus after electricity.
That surplus depends on mining remaining profitable. The heat pump’s performance does not depend on Bitcoin’s price.
There is also a practical loss: the report said the home could not use more than half the heat produced under the continuous-operation example. An external dry cooler releases surplus heat outdoors, particularly in summer.
SunBit quoted about $20,200 for one installation example, excluding extras. With avoided oil purchases and the modelled mining surplus, it estimated payback at roughly three and a half years, excluding maintenance and financing costs. The report separately gave an installed-price range of $20,400–$31,400 and estimated payback periods of three to six years.
The 2028 halving changes the calculation
The next Bitcoin halving was expected in spring 2028, reducing the block subsidy from 3.125 BTC to 1.5625 BTC. Buyers could therefore encounter a major revenue change before recovering their installation costs.
SunBit’s calculator did not incorporate the halving. It estimated payback from prevailing mining economics, and the company did not promise fixed returns.
Holding the report’s other assumptions constant, estimated mining revenue would fall from about $0.13 to $0.07 per kilowatt-hour after the halving—below the assumed $0.11 electricity price. The resulting net heating cost would be roughly $0.04 per kilowatt-hour of heat. Under that same calculation, Bitcoin would need to reach about $131,000 to restore “free” heating.
Even the report’s pre-halving operating break-even price of roughly $70,000 excluded equipment costs and assumed unchanged network computing power. More competing miners would reduce an individual machine’s expected bitcoin output.
The durable distinction is simple: heat production can remain steady while mining income changes. Reusing that heat may improve a miner’s economics, but it does not make household heating independent of Bitcoin’s price, network competition or the cost of the equipment.
Original article on PANews — published November 9, 2026, at 21:49 (UTC+8).