Heat pump performance at -5, -10 and -15°C: how to correctly read technical data

The nominal power of a heat pump is not constant at all outdoor temperatures. For a correct selection, performance tables must be examined.

Thermal power

We check how many kW the unit delivers under actual design conditions of the area.

COP

The COP typically decreases as the outdoor temperature drops and as the required water temperature increases.

Supply temperature

Data for A7/W35 cannot be used to directly predict operation at -10°C with 50°C water.

Defrost

Actual seasonal performance includes losses from defrost cycles.

Correct comparison

We compare models under the same conditions of outdoor air and water temperature.