Should you change radiators when you have a new boiler installed?

There is no need to change the radiators at the same time as the boiler but there are some advantages in upgrading the radiators especially if they are old.

When the boiler is replaced a competent heating engineer will ensure the system is fully cleaned, the best way of doing this is to carry out a full powerflush, fit a magnetic filter and carry out a water test. If this is done correctly the old radiators will not cause any problems to the new boiler. This process will still need to be done even if all the radiators are changed as the central heating pipework will still contain dirt.


So why consider changing the Radiators?

  • New radiators are more efficient, they are designed with fins to create convected heat as well as radiate heat. This works by the air circulating by cold air near the floor being drawn into the radiator by natural convection the radiator transfers the heat into the air which then raises to the ceiling, starts to cool and drop down until it repeats. This does not happen as well in old radiators.
  • Old radiators contain a lot more water than new radiators, this means the boiler must heat more water to get the radiator hot. This costs more on your gas bill and works the boiler harder than it would otherwise have to.
  • Everything leaks eventually, the welded seals on old radiators can fail, also pin hole leaks can occur. Most modern radiators come with long guarantees.
  • They look nicer, obviously this is a personal choice, but there are designs of radiators that look much better. Some designer radiators put looks over function however so it’s always worth checking the heat output of the radiator to ensure you will still be warm enough.