Antminer S19 Pro vs Antminer S21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S19 Pro | Specification | Antminer S21 |
|---|---|---|
| 110.0 TH/s | Hashrate | 200.0 TH/s |
| 3,250 W | Power Consumption | 3,500 W |
| 29.6 J/TH | Efficiency | 17.5 J/TH |
| 75 dB | Noise Level | 75 dB |
| 14.4 kg | Weight | 14.6 kg |
| 11,089 BTU/hr | BTU Output | 11,942 BTU/hr |
| 84/100 | Home Mining Score | 36/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S19 Pro
Antminer S21
Based on BTC price of $78,155 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
A direct generational leap from the S19 Pro to the S21. This comparison shows the real-world impact of advancing from one mining generation to the next.
The S21 offers roughly 40% better efficiency than the S19 Pro. This is a substantial improvement that dramatically affects profitability, especially at higher electricity rates. The S19 Pro is now a previous-gen workhorse heading toward end-of-life for profitable mining.
Spec Deltas
Here is every spec where the Antminer S19 Pro and Antminer S21 actually differ, with the gap quantified:
- Antminer S21 82% more hashrate (110 vs 200 TH/s)
- Antminer S19 Pro 7% better power draw (3,250 vs 3,500 W)
- Antminer S21 41% better efficiency (29.6 vs 17.5 J/TH)
- Antminer S19 Pro 1% better weight (14.4 vs 14.6 kg)
- Antminer S21 8% more heat output (11,089 vs 11,942 BTU/hr)
- Antminer S19 Pro 133% more home mining score (84.0 vs 36.0)
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.
| Antminer S19 Pro | Metric | Antminer S21 |
|---|---|---|
| $2,500 | Upfront cost (MSRP) | $5,500 |
| -$3.84 | Daily net profit | -$1.21 |
| -$3,903 | Net after 1 year | -$5,941 |
| -$5,306 | Net after 2 years | -$6,381 |
| -$6,709 | Net after 3 years | -$6,822 |
| 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
Antminer S19 ProScore: 84/100. 75 dB noise level.
Best for Efficiency
Antminer S2117.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
When should I replace my S19 Pro with an S21?
When the S21's efficiency advantage generates enough extra profit to cover its purchase price within your acceptable ROI timeline. At rates above $0.08/kWh, the switch makes financial sense relatively quickly.
Can I use my S19 Pro power supply with an S21?
It depends on the specific PSU model and wattage rating. Both use similar power connections, but always verify the PSU output matches the S21's requirements. APW12 units typically work with both.