How does a TRV work? We explain what they do and how best to use them

Hand turning TRV on white radiator against teal wall
(Image credit: Getty Images)

Ever wondered how does a TRV work? If you’ve got radiators you almost certainly have thermostatic radiator valves installed in your home. But what do they do? What makes them different from a standard manual radiator valve?

One of the key benefits of a Thermostatic Radiator Valve is that it is one of the cheapest ways to heat a room. Why? Because it automatically controls the flow of hot water to a radiator. This means you can choose which room needs the most heat and which needs the least, helping you save on your heating bill. Here you can find out what's inside a TRV and how to use them effectively.  

How does a TRV work? What’s inside?

Steve Jenkins

Steve Jenkins is a freelance content creator with over two decades of experience working in digital and print and was previously the DIY content editor for Homebuilding & Renovating. 

He is a keen DIYer with over 20 years of experience in transforming and renovating the many homes he has lived in. He specialises in painting and decorating, but has a wide range of skills gleaned from working in the building trade for around 10 years and spending time at night school learning how to plaster and plumb.

He has fitted kitchens, tiled bathrooms and kitchens, laid many floors, built partition walls, plastered walls, plumbed in bathrooms, worked on loft conversions and much more. And when he's not sure how to tackle a DIY project he has a wide network of friends – including plumbers, gas engineers, tilers, carpenters, painters and decorators, electricians and builders – in the trade to call upon.