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[Solved] Hot water issue, never seen this before: Grant Heat Pump and Cylinder

Marvinator80 · 2024-01-21T22:01:55Z

This is so weird. Cylinder is heating up fine. Temp says 53 right now. But when I run the cold tap it’s hot only for a short period and then cools down very quickly so I have lukewarm water at best. Anyone ever had this? Baffled of Ayrshire

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Domestic Hot Water & Cylinders

Last Post by Marvinator80 2 years ago

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Tom Sharpe

(@tomnewarkcylinders)

New Member Member

Joined: 2 years ago

Posts: 1

25/01/2024 9:53 am

Hi all. A faulty mixer valve sounds like a likely cause to me too. Failing that there could potentially be some cross-flow going on; I notice on the photo of the combination pressure reducing valve, that the balanced cold outlet is plugged. Maybe there's a point in the system at which the higher-pressure cold supply is overpowering the reduced-pressure hot supply, travelling the wrong way down the hot draw off, and subsequently cooling the top of the cylinder down. A bit of a long shot, but this could be something to explore if a mixer valve issue is ruled out.

👍

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Marvinator80

(@marvinator80)

Reputable Member Member

Joined: 4 years ago

Posts: 201

Topic starter 26/02/2024 10:34 am

@tomnewarkcylinders

hi Tom, thank you and thanks to everyone else who replied.

it turned out to be a faulty shower that was causing the issue. This was closed off by a plumber and it fixed the issue straight away. Has now been replaced.

took 3 different plumbers to figure it out but we got there. Nothing to do with the pump or cylinder in the end.

👍

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