The Bitmain Antminer S19k Pro is a late-generation S19-series miner that brought significant efficiency improvements to the platform through its use of the BM1366 ASIC chip. At 120 TH/s and 23 J/TH, the S19k Pro slots in as one of the most efficient S19-era machines — bridging the gap between the older S19j Pro and the next-generation S21 lineup.
Released in 2023, the S19k Pro became a popular choice for operators seeking to extend the viability of their S19-class infrastructure without committing to the premium pricing of S21-generation hardware. Its lower power draw (2,760W) also makes it one of the more practical options for home mining setups with 220V circuits.
Antminer S19k Pro Full Specifications
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer S19k Pro |
| Algorithm | SHA-256 |
| Hashrate | 120 TH/s |
| Power Consumption | 2,760W (±5%) |
| Efficiency | 23 J/TH |
| Noise Level | 75 dB |
| Weight | 13.0 kg |
| Dimensions | 400 x 195 x 290 mm |
| Operating Temperature | 5-45 °C |
| Cooling | 4 x high-speed fans (air-cooled) |
| ASIC Chip | BM1366 |
| Chip Count | ~252 |
| Input Voltage | 200-240V AC |
| Network Connection | Ethernet (RJ45) |
| Release Date | 2023 |
Performance Analysis
The S19k Pro’s 23 J/TH represents a meaningful step up from the S19j Pro (29.5 J/TH) and the S19 Pro (29.5 J/TH), offering roughly 22% better efficiency while maintaining the same physical form factor. It is also slightly more efficient than the Whatsminer M50S at 26 J/TH.
However, the S19k Pro falls behind the S19 XP (21.5 J/TH) in efficiency and well behind the next-generation S21 (17.5 J/TH). At today’s difficulty levels, the 23 J/TH efficiency means the S19k Pro requires electricity under approximately $0.08/kWh to remain comfortably profitable.
The S19k Pro’s key advantage is its relatively lower power draw of 2,760W, making it one of the least power-hungry full-size ASIC miners — a significant consideration for home miners working within residential electrical panel limits.
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 | $3.31 | $99 | Profitable — the lower wattage shines with cheap power |
| $0.08/kWh | $5.30 | $159 | Marginal — viable but margins thin at average North American rates |
| $0.10/kWh | $6.62 | $199 | Tight — approaching break-even depending on BTC price and difficulty |
| $0.12/kWh | $7.95 | $238 | Unprofitable in most conditions — consider firmware underclocking or dual-purpose heating |
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
Home Mining: The S19k Pro’s 2,760W power draw is one of the lowest among full-size ASIC miners, making it easier to integrate into residential electrical systems. A 15A 240V circuit can handle one unit comfortably. Pair it with a D-Central cooling shroud to manage noise and direct waste heat.
Budget Mining Farms: For operations with access to cheap electricity (under $0.06/kWh), the S19k Pro offers a low acquisition cost per TH/s. Its lower power demand also means less infrastructure investment in electrical capacity.
Dual-Purpose Heating: At 2,760W, the S19k Pro outputs approximately 9,418 BTU/h of heat — suitable for heating a medium-sized room. This is an ideal candidate for D-Central’s space heater conversion approach. See our Bitcoin Space Heater vs Electric Heater comparison.
Firmware Optimization: The BM1366 chip in the S19k Pro responds well to third-party firmware tuning. With Braiins OS+ autotuning, operators can optimize the power/hashrate curve for their specific electricity cost, potentially improving effective efficiency by 5-10%.
Compatible Firmware
| Firmware | Compatibility | Key Features |
|---|---|---|
| Stock (Bitmain) | Full support | Default firmware, basic configuration |
| Braiins OS+ | Supported | Autotuning, Stratum V2, power capping — excellent results on this model |
| Vnish | Supported | Advanced overclocking, custom profiles, immersion mode |
| LuxOS | Supported | Curtailment features, fleet management, API access |
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 S19k Pro include:
- Hashboard failures: BM1366 chip failures can reduce hashboard output. D-Central stocks BM1366 replacement chips and replacement S19k Pro hashboards.
- Fan errors: Fan bearing wear or speed sensor failures trigger automatic shutdown. Compatible replacement fans are available.
- Temperature warnings: Ensure proper airflow and ambient temperatures within the 5-45 degrees C range.
- Control board issues: Some units may require control board replacement after firmware corruption or power events.
D-Central offers professional Antminer S19k Pro Repair services from our Canadian workshop. We diagnose and repair hashboard, control board, PSU, and fan issues with fast turnaround. See our ASIC Repair Cost Estimator for pricing.
Where to Buy
D-Central stocks the Antminer S19k Pro and ships across Canada and internationally. Buy the Antminer S19k Pro from D-Central — backed by our technical support team and repair services. We also carry BM1366 replacement chips, replacement hashboards, and cooling accessories.