How to repressurise a boiler- Which?

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Published 2022-04-14

If your boiler loses pressure it could be one of a few things. But most commonly, it will either be a leak, you've recently bled your radiators and the system has lost pressure or your heating has been off for a very long time and lost pressure.

0:00 Intro
0:32 How to repressurise a boiler with an external filling loop
1:10 How to repressurise a boiler with an internal filling loop
1:54 How to bleed a radiator

Read more: www.which.co.uk/reviews/boilers/article/boiler-mai… - Which?
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All Comments (9)

@mattmarshall8549 5 months ago

Thanks. This was exactly what I needed.
@loripage5477 7 months ago

Very useful, thank you.
@Ukulelestring 2 years ago

I've been doing this for a while but didn't know how to correct it if you overfill it....that bit was helpful....thank you.
@waterfish6842 2 months ago

Great, thanks
@SCAM-BUSTER.777 2 years ago

Yes. If it keeps happening again and again then you've got a leak on your system. Check for leaks. – Plumber.
@MultiPepsidog 2 years ago

Do all external filling loops need to be pressurised to 1.5 bar as my instructions recommend 1 bar please 🙏 😀?
@johnf3326 2 years ago

I have on a couple of occasions found that the filling loop valves leak slightly and pressure builds over weeks until it gets error high pressure.
@davidpryke8933 7 months ago

Very useful but bloody hell Which? don't assign a gender to plumbing engineers (or any other tradesperson or professional) naughty naughty