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AS water heaters age, they corrode and also incur mineral deposits and sediment at the bottom of the tank. This sediment is what causes the popping noises when the heater turns on. It is mini explosions inside the tank. Having yearly maintenance on the water heaters helps to prolong your heaters from having this issue by flushing out the sediment buildup and replacing the sacrificial anode rods when needed.

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Q: Why does a upstairs hot water heater make a popping noise?
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