Antminer S19j Pro vs Antminer T21
Side-by-side specs, profitability, and home mining comparison.
Quick verdict
For most buyers the Antminer T21 is the stronger pick — Current-generation efficiency advantage even at the budget tier. The Antminer S19j Pro runs 104.0 TH/s at 29.5 J/TH; the Antminer T21 runs 190.0 TH/s at 19 J/TH.
Specs verified against the D-Central Mining Bible \xc2\xb7 June 2026
Specifications Comparison
| Antminer S19j Pro | Specification | Antminer T21 |
|---|---|---|
| 104.0 TH/s | Hashrate | 190.0 TH/s |
| 3,068 W | Power Consumption | 3,610 W |
| 29.5 J/TH | Efficiency | 19.0 J/TH |
| 75 dB | Noise Level | 75 dB |
| 13.2 kg | Weight | 14.6 kg |
| 10,468 BTU/hr | BTU Output | 12,317 BTU/hr |
| 8/100 | Home Mining Score | 8/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Antminer S19j Pro
Antminer T21
Based on BTC price of $60,461 and current network difficulty as of Jun 27, 2026. Actual results vary.
Verdict
The S19 generation's top performer versus the S21 generation's budget option. A cross-generation matchup that tests whether a budget new miner beats a premium old one.
The T21 wins on efficiency despite being the economy option of its generation. New silicon beats old regardless of tier. However, the S19j Pro can be found much cheaper on the secondary market.
Spec Deltas
Stripped to the numbers, this is how far apart the Antminer S19j Pro and Antminer T21 sit on each measurable spec:
- Antminer T21 83% more hashrate (104 vs 190 TH/s)
- Antminer S19j Pro 15% better power draw (3,068 vs 3,610 W)
- Antminer T21 36% better efficiency (29.5 vs 19.0 J/TH)
- Antminer S19j Pro 10% better weight (13.2 vs 14.6 kg)
- Antminer T21 18% more heat output (10,468 vs 12,317 BTU/hr)
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 T21 |
|---|---|---|
| $2,500 | Upfront cost (MSRP) | $4,200 |
| -$4.41 | Daily net profit | -$3.27 |
| -$4,110 | Net after 1 year | -$5,393 |
| -$5,720 | Net after 2 years | -$6,587 |
| -$7,329 | Net after 3 years | -$7,780 |
| 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
TieBoth miners are equally suitable for home use.
Best for Efficiency
Antminer T2119.0 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is a used S19j Pro or a new T21 the better buy?
Depends on price. A very cheap S19j Pro can offer competitive ROI despite worse efficiency due to the lower capital outlay. Above $0.07/kWh electricity, the T21's efficiency makes it the safer long-term bet.
Which is better for space heating?
The S19j Pro draws more power and produces more heat, making it the better space heater. The T21 mines more BTC per watt consumed.