Bitmain Antminer S21 Hyd (335Th) vs Bitcoin Space Heater S9 Edition
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Bitmain Antminer S21 Hyd (335Th) | Specification | Bitcoin Space Heater S9 Edition |
|---|---|---|
| 335.0 TH/s | Hashrate | 12.0 TH/s |
| 5,360 W | Power Consumption | 1,100 W |
| 16.0 J/TH | Efficiency | 91.7 J/TH |
| — | Noise Level | 50 dB |
| 14.2 kg | Weight | 8.0 kg |
| 18,288 BTU/hr | BTU Output | 3,753 BTU/hr |
| 16/100 | Home Mining Score | 59/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | D-Central |
Profitability Comparison
Bitmain Antminer S21 Hyd (335Th)
Bitcoin Space Heater S9 Edition
Based on BTC price of $79,032 and current network difficulty as of May 15, 2026. Actual results vary.
Verdict
Weighing six performance factors, the Bitmain Antminer S21 Hyd (335Th) comes out ahead — it takes 3 of 6 (efficiency, hashrate, price-performance). Its biggest concrete edge: 2692% more hashrate (335.0 vs 12.0 TH/s). That said, the Bitcoin Space Heater S9 Edition isn't beaten everywhere — it still wins power consumption and home mining score and noise level. Cross-check the spec deltas and ROI table above against your own electricity rate before deciding.
Spec Deltas
Here is every spec where the Bitmain Antminer S21 Hyd (335Th) and Bitcoin Space Heater S9 Edition actually differ, with the gap quantified:
- Bitmain Antminer S21 Hyd (335Th) 2692% more hashrate (335.0 vs 12.0 TH/s)
- Bitcoin Space Heater S9 Edition 79% better power draw (5,360 vs 1,100 W)
- Bitmain Antminer S21 Hyd (335Th) 83% better efficiency (16.0 vs 91.7 J/TH)
- Bitcoin Space Heater S9 Edition 44% better weight (14.2 vs 8.0 kg)
- Bitmain Antminer S21 Hyd (335Th) 387% more heat output (18,288 vs 3,753 BTU/hr)
- Bitcoin Space Heater S9 Edition 269% more home mining score (16.0 vs 59.0)
Cost & ROI Over Time
Hardware cost is only half the story — here is how each miner's upfront price plays out against cumulative profit at a $0.10/kWh rate.
| Bitmain Antminer S21 Hyd (335Th) | Metric | Bitcoin Space Heater S9 Edition |
|---|---|---|
| $3,999 | Upfront cost (MSRP) | $499 |
| -$0.68 | Daily net profit | -$2.20 |
| -$4,247 | Net after 1 year | -$1,303 |
| -$4,496 | Net after 2 years | -$2,108 |
| -$4,744 | Net after 3 years | -$2,912 |
| Does not pay back at current rates (negative daily profit) | Payback period | Does not pay back at current rates (negative daily profit) |
Projections assume continuous operation, a flat $0.10/kWh rate, and no hardware degradation, pool fees, or BTC price change. Real-world ROI varies.
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
Bitcoin Space Heater S9 EditionScore: 59/100. 50 dB noise level.
Best for Efficiency
Bitmain Antminer S21 Hyd (335Th)16.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Bitmain Antminer S21 Hyd (335Th) vs Bitcoin Space Heater S9 Edition: which one earns more per day?
At the current BTC price and a $0.10/kWh electricity rate, the Bitmain Antminer S21 Hyd (335Th) is more profitable at $-0.68/day compared to $-2.20/day for the Bitcoin Space Heater S9 Edition. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Bitmain Antminer S21 Hyd (335Th) or Bitcoin Space Heater S9 Edition?
The Bitcoin Space Heater S9 Edition is quieter at 50 dB compared to the Bitmain Antminer S21 Hyd (335Th) at 0 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Bitmain Antminer S21 Hyd (335Th) or Bitcoin Space Heater S9 Edition?
The Bitcoin Space Heater S9 Edition scores 59/100 on our Home Mining Score (vs 16/100 for the Bitmain Antminer S21 Hyd (335Th)). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
Bitmain Antminer S21 Hyd (335Th) vs Bitcoin Space Heater S9 Edition: how much does the efficiency gap matter?
The Bitmain Antminer S21 Hyd (335Th) runs at 16.0 J/TH while the Bitcoin Space Heater S9 Edition runs at 91.7 J/TH — a difference of 75.7 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 83% better efficiency (16.0 vs 91.7 J/TH).
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