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When I turn on a cold water tap including the garden hose my instantaneous gas water heater starts up.I have turned the hot water valve off at heater and checked that ALL hot water taps have no flow so its not a crossover.

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    What make and model is your hot water heater? – ThreePhaseEel Apr 25 at 3:23
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    it is a Rheem Integrity 24 Model Noi 871024NF-B – Borisk Apr 26 at 7:35

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