Question

what is the usual unit of the heat rate​

Answer 1

Answer:

Btu/kWh

Accordingly, typical units for heat rate are Btu/kWh. Heat rate is the heat energy input per unit of electrical energy output, or fuel consumption rate for specific levels of power plant output. Heat rate is also the inverse of plant efficiency..

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Answer 2

Answer:

Btu

While efficiency is a dimensionless measure (sometimes quoted in %) heat rate is typically expressed as Btu/kWh. This is because Watt-hours are more commonly used when referring to electrical energy and Btu is more commonly used when referring to thermal energy.