The Bitmain Antminer S19j Pro was one of the most widely deployed Bitcoin miners in history. At 104 TH/s and 29.5 J/TH, the S19j Pro powered a significant portion of the global Bitcoin hashrate through the 2021-2024 era. Built on the BM1362 ASIC chip, it offered a reliable and proven platform that millions of miners trusted for daily production.
While newer machines have surpassed its efficiency, the S19j Pro remains in active service at operations with cheap electricity and continues to be a common entry point on the used market. Its massive installed base also means a robust ecosystem of parts, firmware support, and repair knowledge — making it one of the most serviceable ASIC miners available.
Antminer S19j Pro Full Specifications
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer S19j Pro |
| Algorithm | SHA-256 |
| Hashrate | 104 TH/s |
| Power Consumption | 3,068W (±5%) |
| Efficiency | 29.5 J/TH |
| Noise Level | 75 dB |
| Weight | 13.2 kg |
| Dimensions | 400 x 195 x 290 mm |
| Operating Temperature | 5-45 °C |
| Cooling | 4 x high-speed fans (air-cooled) |
| ASIC Chip | BM1362 |
| Chip Count | ~312 |
| Input Voltage | 200-240V AC |
| Network Connection | Ethernet (RJ45) |
| Release Date | 2021 |
Performance Analysis
At 29.5 J/TH, the S19j Pro sits alongside the Antminer S19 Pro in efficiency, though the S19j Pro typically offered slightly higher hashrate (104 TH/s vs. 110 TH/s) at the expense of a slightly higher power draw. The S19j Pro is less efficient than the S19k Pro (23 J/TH) by about 22% and significantly behind the S19 XP (21.5 J/TH) by 27%.
Against the current generation, the gap is stark: the Antminer S21 at 17.5 J/TH is 41% more efficient while delivering nearly double the hashrate. The Whatsminer M60S at 18.5 J/TH similarly outclasses the S19j Pro on efficiency.
This does not make the S19j Pro worthless — far from it. At very cheap electricity rates or in dual-purpose heating scenarios where the electricity cost is offset by heating value, the S19j Pro’s low acquisition cost on the used market can still make economic sense. The key question is always: what does your electricity cost?
For a full ranking of miners by efficiency, see our Most Efficient Bitcoin Miners 2026 guide.
Profitability Snapshot
Estimated daily revenue and cost at current network difficulty (approximate, based on typical 2026 conditions). Actual results depend on Bitcoin price, network difficulty, and pool fees.
| Electricity Rate | Daily Power Cost | Monthly Power Cost | Viability |
|---|---|---|---|
| $0.05/kWh | $3.68 | $110 | Marginal to profitable — viable with cheap power, but thin margins |
| $0.08/kWh | $5.89 | $177 | Likely unprofitable — power costs may exceed mining revenue at current difficulty |
| $0.10/kWh | $7.36 | $221 | Unprofitable as a pure miner — consider dual-purpose heating to recover value |
| $0.12/kWh | $8.84 | $265 | Unprofitable — only viable as a space heater that also mines |
Use our Bitcoin Mining Profitability Calculator for real-time estimates with your exact electricity rate, or check our Bitcoin Mining Electricity Cost by State & Province guide to find your local rate.
Best Use Cases
Dual-Purpose Space Heater: This is where the S19j Pro truly shines in 2026. At 3,068W, it outputs approximately 10,468 BTU/h of heat. With D-Central’s cooling shrouds, the exhaust can be ducted directly into living spaces. You are effectively heating your home with Bitcoin mining — and any mining revenue is a bonus on top of the heating value. Check our Bitcoin Space Heater vs Electric Heater comparison.
Ultra-Cheap Electricity Operations: At sub-$0.04/kWh rates (hydro, flare gas, stranded energy), the S19j Pro’s extremely low acquisition cost on the used market can make it the highest-ROI option. The machine itself may cost a few hundred dollars, and every sat it mines is nearly pure profit.
Mining Education and Training: The S19j Pro’s widespread availability, massive knowledge base, and robust firmware ecosystem make it ideal for learning ASIC mining. New miners can acquire one cheaply, experiment with firmware, learn thermal management, and understand the economics before investing in newer hardware.
Parts and Repair Practice: For aspiring ASIC repair technicians, the S19j Pro platform is the most well-documented. D-Central’s repair guides and parts inventory are extensive for this model.
Compatible Firmware
| Firmware | Compatibility | Key Features |
|---|---|---|
| Stock (Bitmain) | Full support | Default firmware, basic configuration |
| Braiins OS+ | Fully supported | Autotuning, Stratum V2, power capping — can improve efficiency significantly |
| Vnish | Fully supported | Advanced overclocking, custom profiles, immersion mode |
| LuxOS | Fully supported | Curtailment features, fleet management, API access |
The S19j Pro has the most mature third-party firmware ecosystem of any ASIC miner. All major firmware options have been extensively tested and optimized for this platform. Running Braiins OS+ with autotuning and power capping to ~2,000W can significantly extend the machine’s profitable lifespan by reducing J/TH.
For detailed installation instructions, see our guides:
- Antminer Firmware Compatibility Matrix 2026
- Braiins OS+ Setup & Configuration Guide
- Vnish Firmware Guide
- LuxOS Firmware Guide
- Antminer Firmware Update Guide
Common Issues & Repair
Common issues with the Antminer S19j Pro include:
- Hashboard failures: After years in service, BM1362 chip failures are increasingly common. D-Central stocks BM1362 replacement chips and replacement S19j Pro hashboards.
- Fan degradation: Bearings wear after tens of thousands of hours. Compatible replacement fans restore proper cooling.
- Thermal paste degradation: After 2+ years, thermal paste between chips and heatsinks dries out, reducing thermal transfer. Re-pasting improves chip temperatures and extends hashboard life.
- Control board issues: The C52 control board is well-understood and fully serviceable. Replacement control boards with pre-installed Braiins OS are available from D-Central.
- PSU wear: The APW12 power supply can degrade over time, causing voltage instability. Replacement APW12 PSUs are in stock.
D-Central offers professional Antminer S19j/S19j Pro Repair services from our Canadian workshop. As one of the most commonly repaired miners in our shop, we have deep expertise with this platform. See our ASIC Repair Cost Estimator for pricing.
Where to Buy
D-Central stocks the Antminer S19j Pro (new and refurbished) and ships across Canada and internationally. Buy the Antminer S19j Pro from D-Central — backed by our technical support team, repair expertise, and the most comprehensive S19j Pro parts inventory in Canada including BM1362 chips, replacement hashboards, control boards, and power supplies.