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Bitcoin heaters convert the waste heat from ASIC mining hardware into home heating. You pay for electricity to heat your home anyway — so why not mine Bitcoin with that electricity at the same time?
21Energy — UK Bitcoin Heater Range
| Model | Heating Output | Hashrate | Noise | Price |
|---|---|---|---|---|
| 21Energy Home S1 | 1,400W | 14 TH/s | 35dB (library) | £849 |
| 21Energy Home S1 Pro | 2,200W | 22 TH/s | 38dB | £1,299 |
| Standard Fan Heater | 2,000W | — | 45dB | £40 |
UK ROI Calculation (April 2026)
- UK electricity: ~28p/kWh average
- 21Energy S1: £0.39/hour electricity cost
- Daily mining revenue (14 TH/s): ~£0.18-0.30
- Net heating cost: £0.09-0.21/hour vs £0.56/hour equivalent electric heating
- Break-even on hardware: ~18-24 months at current BTC price
Good for
Home offices, single rooms, garages, utility rooms in winter
Not ideal for
Main living spaces (noise concerns), summer months, gas central heating homes
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Shop 21Energy Bitcoin Heaters
10% commission — direct deal | Free UK delivery
View 21Energy →Sento earns a referral if you click — never affects our recommendations.
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Sento earns a referral if you click through our links — this never affects our recommendations. Prices and details correct at time of publication. Updated April 2026.