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rheem blog

The Ultimate Guide to Water Heater Noises: What’s Normal (and What Isn’t)

June 10, 2026

“What is that noise?” It’s a question we’ve all asked when our water heater starts clanging or hissing. A noisy water heater can be worrisome, especially when sounds start out of nowhere. The good news? Not every noise means something is wrong. Many sounds are part of normal operation. However, others can mean pressure issues, sediment buildup or even potential safety risks. This guide breaks down what those sounds mean, when to take action and how to keep your system running smoothly. What Water Heater Noises Are Normal? Before assuming the worst, rest assured that a water heater making noise…

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Boiler • 1 Boiler Techs • 1 Boilers • 2 Combi Boiler • 2 Facility Managers • 10 Heat Pump Water Heaters • 4 Homeowners • 97 Hot Water • 1 News • 11 Plumbers • 83 Recirculation • 1 Space Heating • 2 Tankless • 1 Tankless Gas Water Heaters • 1 Water Heater Maintenance • 1 Whole Home Heating • 2 Winter Prep • 1 ˣ Clear filter

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