Antminer S21 Hydro Review and Specs 2026
Bitmain · Released 2024-02 · Hydro-cooled Bitcoin ASIC
Full Specifications
| Manufacturer | Bitmain |
| Model | Antminer S21 Hydro |
| Algorithm | SHA-256 |
| Cooling Type | Hydro Cooling |
| Hashrate | 319 TH/s |
| Power Consumption | 5,360 W |
| Efficiency | 16.8 J/TH |
| Noise Level | 45 dB |
| Dimensions | 400×195×290 mm |
| Weight | 17.2 kg |
| Est. Market Price | $5,000 |
| Release Date | 2024-02 |
| Spec Confidence | ✓ Verified |
Where to Buy Antminer S21 Hydro
Compare prices across trusted ASIC marketplaces. Prices vary — check each source for current availability.
Large used ASIC inventory. Good for budget buyers.
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ROI Analysis
Based on current network difficulty. Assumes Abundant Mines hosting at $225/month flat fee.
Pros & Cons
Pros
- +319 TH/s exceptional hashrate
- +Low 45 dB noise profile
- +Liquid cooling extends lifespan
- +Lower price than S21 Pro Hydro
Cons
- −Requires hydro cooling infrastructure
- −Higher per-unit cost than air models
- −Fewer compatible hosting facilities
Best For / Worst For
Large operations with hydro infrastructure wanting strong hashrate at lower cost than S21 Pro Hydro
Operations without hydro cooling — high infrastructure barrier
Frequently Asked Questions
Is the Antminer S21 Hydro profitable in 2026?
Profitability depends on live BTC price and network difficulty. At $100,000 BTC the Antminer S21 Hydro generates approximately 17.63 USD per day gross revenue at 319 TH/s. With typical hosted electricity costs, net daily profit depends heavily on your hosting rate. Use our calculator above for your specific scenario.
How much does the Antminer S21 Hydro earn per day?
The Antminer S21 Hydro mines approximately 0.00017628 BTC per day at current network difficulty (~113.7 EH). At $100,000 per BTC that's roughly $18 gross per day before electricity and hosting costs. Check the live calculator above for current BTC price.
What hosting providers support the Antminer S21 Hydro?
The Antminer S21 Hydro uses Hydro Cooling. Compatible hosting providers include Simple Mining. Abundant Mines is recommended for air-cooled miners at a flat $225/month all-in rate.
What is the efficiency of the Antminer S21 Hydro?
The Antminer S21 Hydro achieves 16.8 J/TH (joules per terahash), meaning it uses 16.8 joules of energy for every terahash of mining power. This is excellent efficiency — among the best available.
Running the numbers on Antminer S21 Hydro?
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