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New UK research shows that thermostatic radiator valves (TRVs) can help homes with air source heat pumps use up to 8% less energy for heating, while also improving comfort and control from room to room.
The findings come from independent testing carried out by the University of Salford, in partnership with BEAMA (the UK trade association for heating and electrical manufacturers).
What Are TRVs?
TRVs are the valves fitted to radiators that let you set different temperatures in different rooms, to optimise comfort in rooms in use, and save energy in those that aren’t.
Smart TRVs take control and potential energy savings a step further by:
· Communicating wirelessly with a smart heating hub
· Providing app control from anywhere
· Allowing users to set custom schedules for every room they’re installed in
TRVs are common in homes with gas boilers, and this research confirms they work well with air source heat pumps too.
What the Research Found
The Salford “Energy House” tests found that when TRVs are used correctly with an air source heat pump:
- Heating energy use can be reduced by 6–8%
- Rooms can be controlled individually, improving comfort
- Heat pump efficiency is not reduced
- Heat leakage into neighbouring rooms is reduced, helping avoid overheating
In simple terms: you stay comfortable, waste less heat, and your heat pump doesn’t have to work as hard.
Why This Matters for Homeowners
Some homeowners have been unsure whether TRVs are suitable for heat pumps, worrying they might reduce performance or cause problems.
This research shows the opposite:
· When installed properly, TRVs support efficient heat pump operation
· They deliver the type of room‑by‑room control people expect
· They help normalise heat pumps as a like‑for‑like replacement for gas boilers
That’s good news for anyone considering (or already using) a heat pump.
How to Get the Best Results
To make sure TRVs deliver energy savings without affecting performance, the researchers recommend:
Correct system design
A heat pump should include a volumiser and automatic bypass to ensure there’s always enough water flowing through the system.
Using TRVs as a fine‑tuning tool
TRVs should gently reduce room temperatures rather than completely shutting off radiators. An experienced installer will know how to set this up correctly.
Expert View
Kelly Butler, Director of External Affairs at BEAMA, explains:
“These findings mean installers can confidently specify TRVs with heat pumps, giving customers the familiar room‑by‑room control they expect from traditional heating systems — while still maximising energy efficiency and comfort.”
The Bottom Line
If you’re thinking about installing an air source heat pump (or already have one) TRVs can play an important role in lowering heating bills, improving comfort room‑by‑room, and making your heat pump feel more familiar and easier to live with.
Used correctly, TRVs help heat pumps work smarter, not harder.
