10 Best Antminer 2025 in the United States

The BITMAIN Antminer S21 XP 270T is designed for serious cryptocurrency miners looking for high performance. It offers a strong hash rate of 270 terahashes per second (TH/s), which means it can process a large number of Bitcoin and similar SHA256-based currency transactions quickly. However, this power comes with significant electricity use—running at 3645 watts—which is quite high and will impact your electricity costs.

The machine uses an air-cooling system, a common and generally effective method, but it may produce considerable noise during operation, which is typical for high-powered miners and something to consider if space and noise are concerns. The build quality appears solid with a sturdy form factor weighing about 18.7 kilograms, indicating durability for long-term use.

Returns are very limited unless there's a product defect, and local taxes or import duties will be your responsibility. This miner is best suited for those who have experience with mining setups and can manage the power demands and noise, aiming for high-efficiency mining gains.

The Antminer S21+ 235T is a high-powered Bitcoin mining machine designed to offer strong performance with a hash rate of 235 terahashes per second (TH/s). It uses 3878 watts of power, which translates to an energy efficiency of about 16.5 watts per terahash, meaning it provides good mining output while managing electricity costs fairly well. This miner includes an air-cooling system to keep the device running at optimal temperature, but as with most powerful miners, it produces a significant amount of noise, so it may not be ideal for quiet environments or residential use.

It operates on an input voltage between 220V and 277V, so proper power supply is essential to avoid damage. The machine’s build is sturdy and comes with a power supply unit (PSU) and power cords, making it ready for setup out of the box. Connectivity details are standard, supporting PCI Express configuration, suitable for most mining setups.

This miner is marketed as more powerful and cost-effective compared to some predecessors, but buyers should be aware of a substantial 40% restocking fee if returned within 30 days, which encourages careful consideration before purchase. This device is suited for serious Bitcoin miners looking for high performance and good energy efficiency, but it requires the right electrical setup and tolerance for noise.

The Bitmain Antminer L9 by TheTechWave is a strong choice for those interested in mining cryptocurrencies like Litecoin and Dogecoin using the scrypt algorithm. It offers a solid hash rate of 17 GH/s, which means it processes mining tasks quite efficiently. However, this comes with a relatively high power consumption of 3400 watts, requiring a 220V power supply, so it won’t work with standard residential outlets in many countries without special wiring.

The cooling system relies on two fans that use air to keep the device from overheating, a common approach for miners, though it can generate noticeable noise during operation. The miner connects via a single ATX-type connector and includes a compatible power cord, simplifying setup for those with the proper electrical infrastructure. In terms of build quality, the device weighs 30 pounds and appears sturdy, designed for continuous, heavy-duty use in mining environments. One limitation is the power supply design, which is non-modular, potentially making cable management less flexible.

Due to its size and power requirements, the unit is best suited for dedicated mining setups rather than casual or home use. Shipping may experience delays due to market conditions, so planning ahead is advisable. The Antminer L9 delivers strong mining performance for serious users willing to accommodate its power and cooling needs, but it may not be ideal for beginners or those without the proper electrical setup.