Cause of Noise in a Hot Water Heater
Before trying to diagnose strange water heater sounds, it is important to follow some safety steps. Power needs to be turned off to an electric water heater and a gas water heater's control valve must be shut off. Consider contacting the water heater manufacturer for permission to make repairs without affecting the warranty. Does this Spark an idea?
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Normal Sounds
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Normal water heater noises include the hissing sound made as gas enters a gas water heater. Electric water heaters also emit sounds as water heats and as heater components expand or contract.
Tank Sounds
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Sediment buildup can cause strange noises in gas water heaters, especially in a hard water situation. Steam bubbles form beneath the settled sediment, creating thumping, banging, gurgling and popping sounds. Condensation dripping onto the water heater's hot burner creates an audible sizzling.
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Pressure Sounds
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If the water heater sounds as if it is boiling the water inside, this could indicate overheating. A leaking sound coming from the heater's bottom also indicates pressure buildup within the unit. In either of these situations, a service professional should be contacted immediately. Ignoring these sounds could result in an exploding water heater.
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