Normal operating sounds for a residential water heater include soft, faint hissing as gas burners fire up, gentle murmuring or low hums during heating cycles, and occasional quiet clicking from electrical 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 banging noises, which indicate heavy sediment scaling or dangerous pressure issues requiring immediate troubleshooting. Verification: Listen to your water heater during active heating cycles to distinguish normal operating sounds from sediment boiling noises.
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