A heat pump works best when the building, emitters and controls are considered together rather than treating the unit as a direct boiler replacement.
Check heat loss first
A room by room heat loss calculation shows how much heat the home needs on a cold day. This informs the heat pump size and highlights where insulation or airtightness improvements may reduce demand.
Review radiators and controls
Heat pumps run efficiently at lower flow temperatures, so existing radiators may need to be checked or upgraded. Good zoning, weather compensation and careful commissioning are just as important as the equipment.