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No main flame, bad thermocouple, power outage, valve shut off , bad heating element, tank aqua stat set to low, tank does not have enough volume, sediment build up inside the tank ,electrodes encased with mineral deposits, no return circulation, T&P keeps relieving thus wasting H/W, electrolytic action blocking either the inlet or outlet. Tank leaking

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17y ago

What else can I help you with?