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ASIC miners are purpose-built machines for Bitcoin mining. In 2026, efficiency (Joules per Terahash) matters more than raw hashrate — especially at UK electricity prices. This guide compares the top models.
Top ASICs Compared
| Model | Hashrate | Power | Efficiency | Price | ROI |
|---|---|---|---|---|---|
| Antminer S21 | 200 TH/s | 3,500W | 17.5 J/TH | £4,000 | 18–24 months |
| Whatsminer M60 | 180 TH/s | 3,400W | 18.9 J/TH | £3,500 | 20–26 months |
| AvalonMiner 1466 | 150 TH/s | 3,400W | 22.7 J/TH | £3,000 | 22–28 months |
Why Efficiency Matters
J/TH = Joules per Terahash (lower is better). At UK electricity prices (£0.30/kWh), efficiency is MORE important than hashrate. A more efficient miner earns the same Bitcoin for less electricity cost.
Our Pick: The Antminer S21 has the best efficiency at 17.5 J/TH. It costs more upfront but saves £50–80/month in electricity vs less efficient models.
Where to Buy Safely
- Amazon UK — Safest option, buyer protection and warranty
- Direct from manufacturer — Bitmain.com, MicroBT.com
- Avoid: eBay, AliExpress second-hand listings (scams common)
Important: Never buy used ASIC miners from unverified sellers. Counterfeit and damaged units are extremely common on marketplace sites.
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Is Mining Profitable in the UK?
Run the numbers before you buy — our profitability analysis
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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 February 2026.