Normal operating sounds for a residential water heater include soft, faint hissing as gas burners ignite, gentle murmuring or low humming during active heating cycles, and quiet clicking from electrical control relays or thermostats turning on and off. Because water expands slightly as it heats up, minor sounds associated with thermal expansion are also acceptable. However, you should never hear loud rumbling, violent popping, screeching, or hammering noises, which indicate heavy sediment scaling or dangerous pressure issues. Verification: Listen to your water heater during active heating cycles to distinguish normal operating sounds from sediment boiling noises.
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