Radiator as part of hot water system not heating up

4 Jan 2009
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United Kingdom
My Mother-in-law has a radiator in the bathroom that noremally heats up when the hot water is on. But it is no longer getting hot. It does get hot OK when the heating is on which (I think) suggests no problem with the radiator itself.

Can someone tell me how these systems usually work? I had a look at the pipe layout in the airing cupboard but found it a bit confusing. My late father-in-law was a plumber and was quite creative I think. Is it simply a case of a feed off of the hot water side of things and feeding to the bathroom radiator independently of the heating pipes? I saw a pipe in the airing cupboard that could well be that feed if that's how it works, but couldn't see anything that could be a "return".

Any advice on typical layouts for this would be welcome, along with any advice on what could have caused it to suddenly start misbehaving.

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