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Possibly not enough gas flow. Have a monometer test done along with a complete check up of the heater. Has this been a problem from the time the heater was installed? Could also be a gas line that is not large enough for the length of the run. Also, do you have flexible tubing connected between the heater and the incoming gas line? This may be your problem too. Remove the flex and connect with galv or regular gas pipe as per code in your area. In some states the flex line of any length is illegal.

Ken

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17y ago

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