Reply To: Water Heater

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Avatar photonicktheplumber

    In reply to message posted by Peter:

    If it is gas fired the makers advise that it is quite normal for small amounts of up to 5 litres of water per day to discharge through a pressure relief valve when the main gas burner is firing.
    As the water is heated it expands and releases excessive pressures through the TPR valve which is a safety valve.


    The makers may say that, but I must say that I don’t think it’s normal for a TPR valve to discharge 5 or even 1/2 liter of water daily during the heating cycle of a properly installed and functioning gas water heater. Unless something is amiss, the tank should heat up just fine without its contents exceeding the T&P set points of the valve. If there is too much pressure, you need to find out why, and fix the problem. Sometimes an expansion tank must be added above the heater tank.


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