Possibly, but not always. This is one of the most important factors we assess during our home survey.
Why radiators matter:
Heat pumps work most efficiently at lower flow temperatures (typically 35–45°C) compared to a gas boiler (60–70°C). To deliver the same amount of heat at a lower temperature, radiators sometimes need to be larger.
What we find in practice:
- Many existing radiators work fine — radiators in older homes are often oversized for the room they are in, which means they can work well at lower flow temperatures without being replaced
- Some rooms may need upgrades — typically bathrooms or smaller rooms where the existing radiator is undersized
- Underfloor heating is ideal — if you have underfloor heating in any rooms, it works perfectly with a heat pump as it already operates at low flow temperatures
How we assess it:
During our survey, we carry out a room-by-room heat-loss calculation. This tells us exactly which radiators (if any) need to be upgraded. We include any necessary upgrades in your fixed-price quote so there are no surprises.
Radiator upgrades, when needed, are a modest additional cost and are essential for the system to perform properly.
