Antminer S19j Pro vs Antminer S21
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S19j Pro | Specification | Antminer S21 |
|---|---|---|
| 100.0 TH/s | Hashrate | 200.0 TH/s |
| 3,050 W | Power Consumption | 3,500 W |
| 30.5 J/TH | Efficiency | 17.5 J/TH |
| 75 dB | Noise Level | 75 dB |
| 13.2 kg | Weight | 14.6 kg |
| 10,407 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 S19j Pro
Antminer S21
Based on BTC price of $78,153 and current network difficulty as of May 16, 2026. Actual results vary.
Verdict
The S19j Pro was the workhorse of the 2021-2023 mining era, while the S21 represents Bitmain's current generation. This comparison reveals whether upgrading makes financial sense for home and commercial miners.
The S21 wins decisively on efficiency (17.5 J/TH vs 29.5 J/TH), producing more hashrate for less power. However, the S19j Pro's lower second-hand price makes it competitive for miners with cheap electricity, and its higher heat output is an advantage for space heating applications.
Spec Deltas
The Antminer S19j Pro and Antminer S21 diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Antminer S21 100% more hashrate (100 vs 200 TH/s)
- Antminer S19j Pro 13% better power draw (3,050 vs 3,500 W)
- Antminer S21 43% better efficiency (30.5 vs 17.5 J/TH)
- Antminer S19j Pro 10% better weight (13.2 vs 14.6 kg)
- Antminer S21 15% more heat output (10,407 vs 11,942 BTU/hr)
- Antminer S19j 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 S19j Pro | Metric | Antminer S21 |
|---|---|---|
| $2,500 | Upfront cost (MSRP) | $5,500 |
| -$3.72 | Daily net profit | -$1.21 |
| -$3,859 | Net after 1 year | -$5,941 |
| -$5,218 | Net after 2 years | -$6,381 |
| -$6,577 | 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 S19j ProScore: 84/100. 75 dB noise level.
Best for Efficiency
Antminer S2117.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 worth the upgrade from the S19j Pro?
If your electricity rate is above $0.08/kWh, the S21's efficiency advantage will typically pay for itself within 6-12 months. Below that rate, the S19j Pro remains highly profitable and may be the better value.
Can the Antminer S19j Pro still be profitable in 2026?
Yes, at electricity rates below $0.06/kWh the S19j Pro remains profitable. It is also popular as a space heater since its higher power consumption generates more BTUs for home heating.
Which is better for home heating, the S21 or S19j Pro?
The S19j Pro produces more BTUs per hour due to its higher power consumption (3068W vs 3500W for the S21). However, the S21 mines more BTC per BTU of heat, making it more cost-effective as a dual-purpose heater-miner.