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A heat loss calculation should be performed as per MCS heat pump standards. This will size the heat pump and the radiators or underfloor heating to the required temperatures of each room.

Useful documents include:

Domestic heating design guide (Domestic Building Services Panel)

The underfloor heating design and installation guide

MCS heat pump calculator (heat pump product manufacturers will also have their own heat loss calculation software).

MCS domestic heat pumps best practice guidance

Heat pump installer researching heat pump system design on his computer.