Smart Home Energy 
If you want to stop heating empty rooms but don't need app control, manual TRVs like the Drayton TRV4 let you dial down individual radiators for £30 a valve — fit-and-forget savings with no batteries or Wi-Fi required.
Problem it solves
Lets you control individual radiator temperatures room-by-room to avoid heating unused spaces, reducing gas consumption and heating bills.
Who it's for
Homeowners with wet central heating systems who want basic zoned heating control without smart tech, particularly those with rooms that overheat or are rarely used.
Why we recommend
Good manual TRV with solid reviews.
Savings
- Typical annual saving
- £60–£150/year depending on number of radiators controlled and how many zones are regularly turned down
- Payback period
- Under 1 year per valve
