Frequently Asked Questions

Do air source heat pumps work with normal radiators?

Air source heat pumps work very well with radiator circuits or combinations of radiators and underfloor heating. The primary flow temperature should be set at 50°C, to supply the radiators, whereas the underfloor circuits will have a “blending valve” to decrease this temperature. However, if using radiators, on a heat pump circuit, these will require re-sizing to comply with the lower temperatures of the pump. The radiators will require a correction factor of 2.5 to be calculated which increases their sizes by approximately 30%.

Homeowners and installers are encouraged to contact a member of the Grant UK Design Team for further information about correctly designing and sizing a heat pump system.

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