A Look at Radiator Capacity
Air Source heat pumps, or ASHPs, operate at lower flow temperatures than gas boilers. By operating around 50°C. That means your current radiators deliver less heat if they were sized for a higher-heat system with a flow closer to 75°C. That said, if your home is relatively well-insulated, your current radiators may still be usable when paired with an appropriately sized ASHP.
The Biggest Factors that Impact Performance
To determine if your existing radiators are going to work with an ASHP, consider the following:
- Radiator Size & Type: Larger panel or column radiators have greater surface area and emit more heat at lower temperatures.
- Insulation Levels: Well‑insulated walls, lofts and windows reduce heat loss, so radiators don’t need to work as hard.
- Flow Temperature Settings: Modern ASHPs allow you to adjust flow temperature and use weather compensation controls for efficiency.
When You Should Consider Upgrading Your Radiators
Think about upgrading your radiators if:
- Your current radiators are smaller “designer” types with lower heat output.
- The property is poorly insulated, which can cause significant heat loss.
- You like a higher regular temperature than the optimal flow of an ASHP can deliver.
Maintaining Peak Performance
Bleeding the system regularly helps remove trapped air that reduces efficient heat transfer, and getting your ASHP serviced annually keeps the heat exchanger and compressor working well. Weather compensation controls help refine the flow temperature even further, based on outdoor conditions. This helps the radiators deliver more consistent warmth without wasting energy.
Take A Step Toward a More Comfortable Home
Most existing radiators can be used effectively with an air source heat pump, provided the system has been assessed and optimised properly. To start a conversation about the right hybrid setup for your property, just call us on 0208 936 7639 or enquire online to speak with a member of our expert team.
