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Have a combi boiler and the hot water from my taps are running cold to luke warm. My British Gas engineer has told me it is nothing to do with the boiler but is caused by a faulty thermostat cartridge in my shower mixer. Is this right?

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Hydro line b24 hot water running hot cold

Posted on Feb 11, 2013

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Modern shower valves have an "anti scald device" in them to prevent scalding from to hot water.

They come preset at 120 degrees.

Sometimes they can start to malfunction and all you get is warm, not hot water, they can also be intermittent.

This will only effect the shower valve though, not the other faucets.

Posted on Dec 06, 2008

  • Harold Sharp
    Harold Sharp Feb 11, 2013

    Thank you The problem is all hot water from the Hydro line b24 condensing boiler

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