Antminer S21 series — The most powerful miners on the market in 2025

At the end of this year, the profitability record is undoubtedly attributed to the Antminer S21 series, which represents a new stage in the evolution of Bitcoin mining machines.

Its most powerful model is developed by Bitmain; this generation achieves a computing power that can exceed 245 TH/s, with an energy efficiency of around 15 joules per terahash, a record for the sector.

This model illustrates the current trend: increasingly powerful machines that are also more energy-efficient. In practice, this reduces electricity costs while maintaining a high level of security on the Bitcoin network.

However, users should consider several factors before making a purchase:

• the quality of the power supply,

• ambient temperature,

• and the cost per kWh according to their region.

The Antminer S21 is now emerging as an interesting case study on energy optimization in mining.