The Bitmain Antminer S19 Pro was the flagship of the S19 generation — the most efficient air-cooled Bitcoin miner available when it launched in May 2020. Delivering 110 TH/s at 3,250W, the S19 Pro achieved an impressive 29.5 J/TH efficiency using cherry-picked BM1398 chips in a denser hashboard configuration (114 chips per board versus 76 in the base S19). This made the S19 Pro the miner of choice for professional operations focused on maximizing efficiency.
The S19 Pro quickly became one of the most widely deployed Bitcoin miners in history. From large-scale North American mining farms to home miners with dedicated setups, the S19 Pro delivered the best balance of hashrate, efficiency, and reliability in the 7nm generation. Its proven track record and massive installed base mean that parts, documentation, firmware support, and repair expertise are widely available — a significant advantage for operators planning to run hardware for multiple years.
In 2026, the S19 Pro remains a competitive miner at electricity rates below $0.08/kWh. While the S21 generation has taken the efficiency crown, the S19 Pro’s dramatically lower acquisition cost on the secondary market makes it an attractive option for capital-efficient mining. Its 3,250W heat output (~11,089 BTU/h) also makes it an excellent candidate for space heater conversions. D-Central Technologies offers comprehensive repair, undervolting, and conversion services for the S19 Pro.
Antminer S19 Pro Full Specifications
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer S19 Pro |
| Release Date | May 2020 |
| Algorithm | SHA-256 |
| Hashrate | 110 TH/s (±5%) |
| Power Consumption | 3,250W (±5%) |
| Efficiency | 29.5 J/TH |
| Input Voltage | 200–277V AC |
| Dimensions | 400 × 195 × 290 mm |
| Weight | 14.2 kg |
| Noise Level | ~75 dB |
| Operating Temperature | 0–40°C |
| Humidity | 5–95% |
| Cooling | 4 × high-speed fans |
| Network Connection | Ethernet (RJ45) |
| ASIC Chip | BM1398BB (7nm) |
| Chips per Hashboard | 114 (38 groups of 3) |
| Number of Hashboards | 3 |
| Total Chip Count | 342 |
| Power Supply | Integrated APW12 PSU |
Performance Analysis
At 29.5 J/TH, the S19 Pro is 14% more efficient than the base S19 (34.2 J/TH) and 18% more efficient than the S19j (36.1 J/TH). Compared to the S19 XP (21.5 J/TH), the Pro uses about 37% more energy per terahash. Against the S21 (17.5 J/TH), the gap widens to roughly 69% more energy per terahash. However, the S19 Pro’s secondary market price is a fraction of newer models, making the total cost of ownership competitive in many scenarios.
The S19 Pro delivers 16% more hashrate than the base S19 (110 vs 95 TH/s) at the same 3,250W power draw — a significant advantage for space-constrained deployments where maximizing hashrate per unit matters.
Daily and Monthly Power Costs
| Electricity Rate | Daily Power Cost | Monthly Power Cost | Viability |
|---|---|---|---|
| $0.05/kWh | $3.90 | $117 | Profitable — excellent margins at cheap electricity |
| $0.08/kWh | $6.24 | $187 | Profitable — solid return at average North American rates |
| $0.10/kWh | $7.80 | $234 | Marginally profitable — monitor difficulty and BTC price |
| $0.12/kWh | $9.36 | $281 | Breakeven — space heater conversion offsets heating costs |
Use our Bitcoin Mining Profitability Calculator for real-time estimates.
Heat Output
The S19 Pro produces approximately 11,089 BTU/h of heat (3,250W × 3.412 BTU/W) — identical to the base S19 since they share the same power draw. This significant heat output can heat a large room or small workshop. See our Bitcoin Space Heater vs Electric Heater comparison for the economic analysis.
Compatible Firmware
| Firmware | Compatibility | Key Features |
|---|---|---|
| Stock (Bitmain) | Full support | Default firmware, basic configuration |
| Braiins OS+ | Supported | Autotuning, Stratum V2, power capping |
| Vnish | Supported | Advanced overclocking, custom profiles, immersion |
| LuxOS | Supported | Curtailment features, fleet management |
For guides: Braiins OS+ | Vnish | LuxOS | Firmware Update Guide | BraiinsOS S19 Guide
Best Use Cases in 2026
Cost-Effective Mining: The S19 Pro is arguably the best value in Bitcoin mining hardware in 2026. At secondary market prices that are a fraction of the S21, the dollar-per-terahash acquisition cost is extremely competitive. For miners with electricity under $0.08/kWh, the S19 Pro delivers strong returns on a minimal capital investment.
Space Heater Conversion: At ~11,100 BTU/h, the S19 Pro makes an excellent space heater. D-Central offers Bitcoin Space Heater conversions for the S19 platform.
Home Mining: The S19 Pro’s proven reliability, extensive firmware support, and wide parts availability make it one of the safest choices for home miners who want to “set it and forget it.” At 75 dB, it requires a dedicated space but is manageable with proper placement and ducting.
Undervolting for Efficiency: The S19 Pro is excellent for undervolting with Braiins OS+. Power capping at ~2,500W while maintaining 85-95 TH/s can push efficiency well below 29 J/TH, extending profitability at higher electricity rates. See our Complete Undervolting Guide.
Common Issues & Repair
The S19 Pro is one of Bitmain’s most reliable platforms, but issues can arise over time:
- Hashboard chip failures: BM1398 chips can fail after extended operation, particularly in high-temperature environments. Missing chains or reduced hashrate are typical symptoms. See our Chain X Only Fix Guide.
- APW12 PSU degradation: The integrated power supply can develop issues with output capacitors or MOSFETs after years of continuous operation. See our APW12 PSU Repair Guide.
- Temperature-related shutdowns: Over-temperature protection triggers if airflow is restricted or thermal paste has degraded. See our Temp Too High Fix Guide.
- EEPROM corruption: Can prevent hashboard detection or cause incorrect chip readings. See our EEPROM Error Fix Guide.
D-Central offers professional Antminer S19 Repair services (covering the S19 Pro) from our Canadian workshop. See our ASIC Repair Cost Estimator for pricing.
D-Central Services for the Antminer S19 Pro
- Repair: Hashboard, PSU, control board repair — Antminer S19 Repair
- PSU Service: APW12 diagnostics and repair — APW12 PSU Guide
- Space Heater Conversion: Home heating setup — Bitcoin Space Heaters
- Undervolting: Optimize for your electricity rate — Undervolting Guide
- Replacement Parts: Hashboards, fans, PSU — Shop Parts
- Repair Cost Estimate: ASIC Repair Cost Estimator
Frequently Asked Questions
Is the Antminer S19 Pro still profitable in 2026?
Yes — the S19 Pro remains profitable at electricity rates below $0.10/kWh. At $0.05/kWh, it generates excellent margins. With undervolting via Braiins OS+ or Vnish, profitability extends to higher electricity rates. The S19 Pro’s low acquisition cost on the secondary market makes the total economics very competitive with newer hardware.
How much electricity does the Antminer S19 Pro use per day?
The S19 Pro consumes approximately 3,250W continuously, translating to 78 kWh per day or about 2,340 kWh per month. At $0.10/kWh, that is $7.80/day or $234/month. With undervolting, consumption can be reduced to approximately 2,500W (60 kWh/day).
Can the Antminer S19 Pro be used as a space heater?
Yes — the S19 Pro outputs approximately 11,089 BTU/h of heat, equivalent to a large space heater. D-Central offers space heater conversions for the S19 Pro platform.
How does the S19 Pro compare to the S21?
The S21 delivers 200 TH/s at 17.5 J/TH — roughly twice the hashrate at 40% better efficiency. However, the S19 Pro costs a fraction of the S21 on the used market. Per dollar of capital invested, the S19 Pro can deliver comparable or better returns, depending on electricity cost. See our S19 vs S21 Comparison.
What is the difference between the S19 Pro and S19j Pro?
The S19j Pro (104 TH/s at 3,068W) is a later variant with slightly lower hashrate but better efficiency than the S19 Pro in some configurations. Both use BM1398 chips. The S19j Pro typically carries a modest price premium on the secondary market.