Water heater noisy: popping, rumbling, crackling, humming
Rumbling and popping are usually sediment and scale at the bottom of the tank (gas) or on the elements (electric). They rarely mean the tank is failing but they cut efficiency. Banging or squealing can also come from high pressure and thermal expansion, so check pressure before blaming sediment.
Cross-checked ~60 min easyBrands: All
Before you start
- Electric: breaker OFF before draining; never power a drained tank
- Gas: set control to pilot/OFF before flushing; no gas-side work
- Drain water is scalding: let it cool or use a heat-rated hose and drain to a safe spot
- Booming on burner start-up on a gas unit can mean delayed ignition: turn it off and refer
Diagnostic steps
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