Crypto miners
ASICs that pay rent on surplus solar.
When hashprice clears your feed-in tariff, an ASIC running on surplus kWh is the highest-€/kWh channel in the stack — and the waste heat can return to your home as space or hot-water heat.
Miner overview
- Hashprice
- $58/TH/day
- Reference; live varies
- Best efficiency
- 15J/TH
- BitAxe Gamma (BM1370)
- Highest hashrate
- 180TH/s
- Bitmain Antminer S21 Pro 180T
- Heat recovery
- 5/8
- models route heat usefully
Compare miners
Sorted by hashrate desc.
| Miner | Hashrate | Power | Efficiency | Heat destination | €/yr (24/7 ref) | Price |
|---|---|---|---|---|---|---|
| BitAxe Supra (BM1368) Open-source single-chip | 1 TH/s | 11 W | 22 J/TH | Ambient | €8,997 | €165 |
| BitAxe Gamma (BM1370) | 1 TH/s | 15 W | 15 J/TH | Ambient | €17,995 | €240 |
| FutureBit Apollo BTC II Built-in heater housing | 3 TH/s | 200 W | 67 J/TH | Space heat | €53,984 | €1,180 |
| Goldshell KA-Pro | 2 TH/s | 88 W | 59 J/TH | Space heat | €26,992 | €1,450 |
| Bitmain Antminer S21 Hyd 200T (low-watt) Hydro cooling — water out at 60 °C | 50 TH/s | 1,600 W | 32 J/TH | Hot water | €899,725 | €4,100 |
| MicroBT Whatsminer M50S+ 140T | 140 TH/s | 3,400 W | 24 J/TH | Hot water | €2,519,230 | €5,200 |
| Bitmain Antminer S21 Pro 180T | 180 TH/s | 3,500 W | 19 J/TH | Space heat | €3,239,010 | €6,400 |
| Canaan Avalon A1466 150T | 150 TH/s | 3,500 W | 23 J/TH | Ambient | €2,699,175 | €5,800 |
€/yr column shows revenue if mining 24/7 at the reference hashprice, excluding electricity cost. For surplus-only mining, prorate by your annual surplus hours (typically 1,000–2,000 h/yr in Europe). Real revenue varies with BTC price, network difficulty, and pool fees.
Where the heat goes
Ambient
Ambient dump
Waste heat goes into a basement, garage, or shed. No energy recovery, but easiest to install — no plumbing or ducting required.
Hot water
Hot-water loop
Hydro-cooled miners (S21 Hyd, Whatsminer) heat a 60 °C glycol loop that feeds a domestic hot-water tank. Replaces ~€400/yr of gas water heating in DE/NL.
Space heat
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Specifications from manufacturer datasheets. Some links are affiliate links — we earn commissions on qualifying purchases. This doesn't affect our rankings.