A Bitcoin miner can heat a home. Whether it can pay for that heat is a separate question.
A report published on November 9, 2026, describes a 180-square-metre house in Nokia, Finland, that disconnected from district heating and switched entirely to a SunBit Bitcoin boiler. The system captures heat from mining equipment, stores it in water at temperatures up to 60°C, and supplies radiators or underfloor heating.
Almost all the electricity consumed by the miner becomes heat. The financial proposition is less certain: mining revenue may offset the electricity bill, but the equipment costs more than $20,000 to install, and its earnings depend on Bitcoin’s price and competition across the mining network.
What the homeowner owns
SunBit CEO Elmeri Suomi told CoinDesk that the company delivered its first production systems in 2025 and had 30 operating at the time of the report. All but one were in Finland; the first overseas installation was in Leekum, the Netherlands, in 2025.
Homeowners buy the equipment, pay for its electricity and receive the mined bitcoin, subject to applicable fees. The systems replace or supplement existing heating. In Kotka, for example, a 200-square-metre home combined mining equipment with an oil boiler. At an old manor in Tampere, a system replaced wood heating and kept a 1,500-litre water tank between 50°C and 60°C.
Noise is another practical constraint: miners generally need a basement or a separate sound-insulated room.
One example: the operating-cost calculation
SunBit’s model for the Nokia house used a water-cooled Antminer S21 XP Hydro running Braiins OS, with 495 TH/s of computing power and electricity consumption of about 5.3 kilowatts.
Its assumptions were:
- Continuous operation, consuming roughly 46,400 kWh a year.
- Electricity priced at $0.11 per kWh, with an estimated 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 about $6,100 in annual bitcoin proceeds after its optional 10% service fee. A mining-pool fee of 0.5% would also apply. The resulting operating surplus was approximately $900, before recovering the equipment’s purchase and installation cost.
The optional service includes round-the-clock remote monitoring, adjustments to Finland’s variable electricity prices and a mobile app. Without that service, the model valued annual output at about $6,800, before the pool fee.
These are projections, not guaranteed household results. Suomi also supplied a mining-pool screenshot from an 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 system could replace approximately 2,000 litres of heating oil annually. SunBit said it could not see later customers’ results because they used private pool accounts.
The advantage is mining income, not heating efficiency
A miner converts roughly one unit of electricity into one unit of heat. The report’s heat-pump comparison used 2.5 to 3 units of heat delivered per unit of electricity consumed.
For a home requiring 25,000 kWh of heat annually, SunBit estimated an air-source heat pump’s running cost at about $1,100, compared with $3,170 for district heating. Its mining system, operated only long enough to meet that heat demand, was projected to earn about $490 after electricity costs.
That advantage depends on mining remaining profitable. It does not mean the miner is a more efficient heater.
Continuous operation also produces unwanted heat. In the report’s year-round example, more than half the heat could not be used by the house and was expelled outdoors through a dry cooler, particularly during summer.
The report cited installed system prices of approximately $20,400 to $31,400 and estimated payback periods of three to six years. A separate oil-heating comparison used a $20,200 installation quote and projected roughly three and a half years, excluding maintenance and financing costs.
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. Some buyers could therefore face a major revenue change before recovering their installation costs.
SunBit’s calculator did not include the halving; it projected payback using mining earnings at the time. The company did not promise fixed returns.
Holding the model’s other assumptions constant, the report estimated that mining revenue would fall from about $0.13 to $0.07 per kWh consumed after the halving—below the assumed $0.11 electricity price. Net heating costs would then be about $0.04 per kWh of heat. Under the same calculation, Bitcoin would need to reach approximately $131,000 to restore the “free heating” outcome.
The heat remains useful regardless of Bitcoin’s price. The payback does not: it depends on the coin price, electricity costs, network competition and how much of the heat the household actually needs.
Source: Original article published by TechFlow, November 9, 2026, at 18:07:09 (UTC+8). The supplied article credits reporting to Shaurya Malwa of CoinDesk and Chinese translation to Chopper of Foresight News. All market prices and operating estimates above reflect that report’s historical context.