REH editorial starter discussion. Prepared by REH to invite genuine community replies.
REH starter discussion — UK.
Not necessarily. The design needs to match each room’s heat loss with the radiator output at the proposed water temperature. A larger emitter can provide useful heat at a lower temperature, which can help heat pump efficiency. Ask for the room-by-room schedule and the reason for each proposed replacement, rather than accepting a whole-house assumption.
Join the discussion: Has your quote identified specific rooms needing larger radiators?
Suggested next step: Request a radiator schedule with the heat pump quote.
Sources checked 3 October 2026:
Energy Saving Trust: heat pump myths: https://greenheattoolkit.energysavingtrust.org.uk/t/heat-pump-installers-toolkit/why-heat-pumps/heat-pump-myths/
Energy Saving Trust: room-by-room heat loss: https://greenheattoolkit.energysavingtrust.org.uk/t/heat-pump-installers-toolkit/heat-pump-system-design/heat-loss-calculations-detailed-guidance/