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What is the power rating of the Pipe HEX Active pump kit?

Pipe HEX Active power use

The power rating of the pump is 250 watts and the pump runs around 1/3 of the time the shower is operating, so omits approximately 85 watts.

Therefore, based on a 6-minute shower this output would be 0.008kWh & negligible in comparison with the recovered energy. The energy used by the pump is converted to heat, and therefore not completely lost.