Bitmain Antminer S19k Pro

What is the Bitmain Antminer S19k Pro?

The Bitmain Antminer S19k Pro is a SHA-256 ASIC miner built for reliable, efficient Bitcoin mining at home or in small operations. With a hashrate of 105 to 120 TH/s and a power draw of 2,415 to 2,760 watts, it strikes a strong balance between performance and running cost. It is one of the most popular miners in its class because it is efficient, well supported, and simple to run. Whether you are mining your first sats or running several miners, the S19k Pro is a proven, reliable choice that is easy to run day to day.

Technical specifications

• Hashrate: 105 to 120 TH/s
• Power consumption: 2,415 to 2,760 W (adjustable from 900 W with Braiins OS)
• Efficiency: up to 18 J/TH with Braiins OS, 23 J/TH with Bitmain Stock OS
• Algorithm: SHA-256 (Bitcoin, Bitcoin Cash)
• Operating system: Braiins OS or Original Bitmain OS
• Power supply: 200 to 240 V
• Connectivity: Ethernet
• Cooling: air-cooled
• Condition: New or Refurbished

Power consumption and efficiency with Braiins OS

Efficiency is where the S19K Pro stands out. With Bitmain’s original firmware, it runs at roughly 23 J/TH. Switching to Braiins OS can bring efficiency down to as low as 18 J/TH and allows for fine power tuning between 900 and 2,760 watts.

The J/TH figures provided are reference values from Braiins and relate to undervolted operation under optimal conditions. Braiins itself describes these figures as best measured results achieved at the respective optimal power target. Due to natural chip variance, each unit performs slightly differently, while ambient temperature and cooling can further affect the results. These figures are therefore intended as a guide only and do not represent a guaranteed specification.

Is the Antminer S19k Pro profitable in 2026?

Profitability depends on three things: your electricity price, the Bitcoin price, and network difficulty. The lower your power cost, the better the return, which is why miners with cheap grid power or their own solar get the most out of the S19k Pro. Rather than rely on rough estimates, plug your own numbers into our Bitcoin mining profitability calculator or the Bitcoin mining calculator. If you run solar, the PV mining calculator shows how self-generated power changes the maths.

Getting started with your S19k Pro

Setup is straightforward. The miner runs on a standard 200 to 240 V supply and connects to your network over Ethernet. Once it is powered and online, point it at the mining pool of your choice, then monitor hashrate, temperature, and power from the built-in dashboard. With Braiins OS you also get autotuning and detailed per-chip stats. If anything is unclear, our team can walk you through first setup and ongoing operation in your language.

Noise and the Silent Kit

Like most air-cooled ASICs, the S19k Pro is loud at full speed and is not suited to a quiet room out of the box. If you plan to run it in or near a living area, the S19 Silent Kit significantly reduces the noise and makes home operation far more comfortable. Underclocking with Braiins OS lowers the fan speed and noise further.

Refurbished vs new: which variant should you choose?

The S19k Pro is available both refurbished and new, in hashrates of 105, 110, 115, and 120 TH, with a choice of Braiins OS or Original Bitmain OS.

• Refurbished: fully tested and the best value entry point, ideal if you want the lowest price per terahash.
• New: full lifespan ahead and latest condition, ideal for long-term operation.

For most buyers we recommend Braiins OS for its better efficiency and tuning. Pick the hashrate that fits your power budget, and choose refurbished if value matters most or new if you want maximum lifespan.

Delivery, warranty and support

Every S19k Pro ships fast from Austria within the EU, so EU customers pay no extra customs or import fees. Orders are covered by a 30-day return window, and our multilingual team supports you from first setup through day-to-day operation. More than 5,000 customers across 35+ countries trust 21energy, rated Excellent on Trustpilot.

Note regarding refurbished miners.

Refurbishment:
The miner is cleaned with compressed air to remove dust from the cooling fins and the casing. Despite this cleaning, there may be isolated traces of dust remaining in the cooling fins, or the casing may show slight signs of dust. Each miner is then reassembled and tested to ensure it is in full working order.

Please note:
This is a second-hand Bitcoin miner that was previously operated in a mining farm. Depending on its age and duration of use, there may be visible signs of wear such as scratches. These do not affect the device’s function or performance.