How to isolate a radiator ready to replace or remove to decorate

Hand moving thermostatic radiator valve
(Image credit: Getty Images)

Learning how to isolate a radiator is a skill that any DIYer needs. It's simple, straightforward and cost-effective. Effectively isolating a radiator is stopping the water supply to the radiator. This means that you can then remove it to paint or plaster behind it or you can replace it with a new radiator. 

But be careful if you are going to remove the radiator as it will still be filled with water. Once the valves have been closed you will need to undo the connecting nuts, so have a few bowls ready to catch the radiator water. Once finished painting and reattached the radiator you will need to know how to bleed a radiator to ensure that it does its job properly when you need it. 

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.