Antminer S21 vs Antminer S21 Plus
A detailed spec-by-spec comparison of the two most popular air-cooled Bitcoin miners from Bitmain — helping you decide which is right for your operation.
Full Spec Comparison
Side-by-side specification breakdown
| Specification | Antminer S21 | Antminer S21 Plus ✓ |
|---|---|---|
| Hashrate | 200 TH/s | 216 TH/s (+8%) |
| Power Consumption | 3,500W | 3,348W (less power) |
| Efficiency | 17.5 J/TH | 15.5 J/TH (+12.5% better) |
| Price (Letsmines) | $2,254 | $2,199 (cheaper) |
| Cooling Type | Air (standard fans) | Air (standard fans) |
| Voltage | 220V | 220V |
| Algorithm | SHA-256 (Bitcoin) | SHA-256 (Bitcoin) |
| Noise Level | ~75 dB | ~75 dB |
| Setup Complexity | Standard | Standard |
| Warranty | 365 Days | 365 Days |
| Shipping | 7 Working Days (SPOT) | 7 Working Days (SPOT) |
| Best For | Budget entry / discount deals | Best value air-cooled BTC miner |
Who Should Buy Which?
Recommendations based on your situation
Buy the Antminer S21 Plus if…
You want the best value air-cooled Bitcoin miner available today. At $2,199, the S21 Plus offers 216 TH/s with 15.5 J/TH efficiency — both metrics beating the base S21 at a lower price. It’s the clear winner for new buyers entering the market in 2025.
Buy the Antminer S21 if…
You find the S21 at a significantly reduced clearance price (under $1,800). At full price, the S21 has no meaningful advantage over the S21 Plus. However, used or discounted units may offer attractive ROI for miners on a tight budget.
Consider upgrading to S21 XP if…
You have a slightly higher budget. The Antminer S21 XP (270 TH/s, 13.5 J/TH, $4,590) offers a major efficiency jump over both the S21 and S21 Plus — ideal for operations where electricity cost is a significant factor.
Consider hydro cooling if…
You’re building a serious mining operation. The Antminer S21 Hyd (335 TH/s, 16 J/TH) or S23 Hyd (580 TH/s, 9.5 J/TH) offer dramatically higher hashrates. Hydro systems require infrastructure but reward you with lower per-TH costs long term.