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Discuss Bath Tap Temperature in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi All, I have an odd problem, we moved into our house about 5 years ago and have always had a problem where the bath tap runs from scorching hot to luke warm after it's been running for a minute, despite the heating being on all day, this process can be repeated after switching off for about a min. I think the whole heating system is the original one from about 30 years when the house was built. It's a conventional gas boiler (not combi) and for some reason we have a large combination hot water cylinder, despite it being a 4 bed house with loft (no separate cold water tank). The other taps, en-suite shower, around the house all seem to run hot water continuously with no problem. Any suggestions regarding the problem would be welcome, thanks.
 
Is your bath panel removable? I suspect that you have a thermostatic mixing valve under the bath which potentially is not working correctly or is set too low. This is a safety device installed avoid people scalding themself
 
What make and model of boiler do you have and what make and model of cylinder?
What make and model of boiler do you have and what make and model of cylinder?
I'm not at home to check the exact makes, I believe it's a Potterton, 1980's gas boiler and here's an image of the cylinder.

IMG_2538.jpg
 
Is your bath panel removable? I suspect that you have a thermostatic mixing valve under the bath which potentially is not working correctly or is set too low. This is a safety device installed avoid people scalding themself
Hi, I don't think that's the case because we had the bath and taps replaced about 2 years ago.
 
I don’t understand why if the installer was installing to regulations he should’ve installed one ??
 
Failing that do you have a thermostatic mixer on the bath? That could’ve failed
 
I don’t understand why if the installer was installing to regulations he should’ve installed one ??

I don’t think he needs to as they usually only apply to new builds or a material of change, which from my interpretation is like a barn conversion etc.
 
Shouldn’t make it run like warm though. Are you actually going to check for a TmV or just assume there isn’t one
 
So I’d you don’t know what you’re looking for how can you say it’s not there. May need a pro
 
None of us should assume but you are right. But we don’t know what was there before the bath swap but as the OP doesn’t know what they’re looking for it’s all a bit finger in the wind
 
Based on that set up I would agree with Simon thinking cold backfilling
 
Could be thermostatic though so is capable of dealing with the cold Mains
 
Goosed check valve. Changed a shower last year. All outlets in bathroom not very hot. They spent a fortune on visits to fix the combi. I was referred to change shower and swap taps. Phoned me after to tell me the water had never been so hot in the bathroom. All down to shower.
 
I'm not at home to check the exact makes, I believe it's a Potterton, 1980's gas boiler and here's an image of the cylinder.

View attachment 38195

Check under bath and see if you have on of these.
Google Image Result for https://cdn.aws.toolstation.com/images/141020-UK/800/18520.jpg

If you don't have a TMV send a picture of bath taps and could you try get a clearer image of the cylinder and pipework later on, take a step back and include as much pipework as you can

Does anyone else see two pumps? Maybe a thermal store with a mixer on the side...
 
Thanks for all the advice and prompts. I’ve worked out there is a TMV on the cylinder pipework and think this might be the problem. I’ll let you know how I get on.
 
Yep thermal store
 

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