Whatsminer M7A vs M7B vs M7D: Which Model is Best for Heat Reuse in 2026

With increasing competition in Bitcoin mining, more operators are looking for ways to monetize the heat generated by miners. The Whatsminer M7 series from MicroBT offers one of the best solutions currently available.

The key difference lies in the suffix (D, AS, BS), which determines the maximum outlet water temperature.

Whatsminer M7 Series Comparison

Model Breakdown


Whatsminer M7D

Standard hydro model with outlet temperature up to 65°C. Ideal for traditional high-density data centers, but the heat is difficult to utilize for practical heating.

Whatsminer M7AS

Intermediate model. Outlet temperature up to 70°C. Suitable for domestic hot water (DHW) or low-temperature heating systems.

Whatsminer M7BS — Best for Heat Utilization

The most promising model. Outlet water temperature reaches 90°C. This allows direct use in central heating systems, industrial heat exchangers, and hot water supply. Thermal efficiency approaches nearly 100%.

Simple Rule:

  • M7D — pure mining

  • M7AS — mining + water heating

  • M7BS — mining + full building heating

When hash rate and efficiency are similar, the choice between M7AS and M7BS becomes a strategic decision: whether you want to monetize the heat or not.

Need help calculating the economics of a heat recovery project? Contact us — we’ll prepare a custom calculation for your location and goals.

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