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PostPosted: Sun Jul 08, 2018 4:48 pm 
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Hi,

Wondering if someone could give me an idea as to what could be wrong with with my DHW system.
I've uploaded a crude diagram of my setup which shows a CWS tank in an extension of the house supplying a shower. This particular tank is overflowering via the hot water travelling through the shower mixer and back up through the cold feed and into the tank.
From other discussions I have had it could either be a faulty mixer and I assume the the pressure from the hot water is overpowering the cold supply or potentially a faulty coil in my cylinder.

Any ideas as to what the issue could be, if is is a pressure issue I assume that a check valve on the cold supply from the tank would resolve it?


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PostPosted: Sun Jul 08, 2018 8:03 pm 
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Hard to say without being there to check it over but as the cws in the main house is higher than in the extension any fault with the mixer valve or pin holed coil in hot water cylinder would make the extension cws tank fill up.

I assume you have checked the basics that the filling valve is not constantly running or dripping in the extension cws tank?

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PostPosted: Sun Jul 08, 2018 8:25 pm 
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gas4you wrote:
Hard to say without being there to check it over but as the cws in the main house is higher than in the extension any fault with the mixer valve or pin holed coil in hot water cylinder would make the extension cws tank fill up.

I assume you have checked the basics that the filling valve is not constantly running or dripping in the extension cws tank?


Yes, I've checked the CWS in the extension and confirmed it's definitely not from the ballcock valve.
When I've been up there watching it I can also see the current change from within the tank near the cold outlet, on top of that the pipe from the cold outlet to the shower gets as hot as the hot feed to the shower.

I'm also in the process of having to resolve an issue with aeration to a shower pump in the loft as the previous owners never fitted a flange or anti grav loop so our new shower pump keeps locking out. Unless the 2 issues could be related of course?
I'm torn between paying someone to try and resolve the two showers with flange/a/grav and check valve or just go the whole hog and get a pressurised system in.
I'm concerned if there is an issue with the cylinder then it's a waste of money trying to fix the pump as the boiler we have must be 20 years old, burner probably about 8.

Thanks again


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PostPosted: Sun Jul 08, 2018 9:01 pm 
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I had the same problem a couple of years ago. A faulty shower valve was letting the hot water back up the cold supply. The hot water supply tank being at a higher level than the cold water one. Either a non return valve required in the pipework or shower controls replaced with ones that have non-return built in.

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