A practical homeowner schedule
Use the owner's manual as the controlling maintenance schedule. As a general planning rule, visually inspect the water heater and surrounding area several times a year and consider a professional service visit about once a year, especially for gas-fired tankless equipment, hard-water areas, older equipment or heavy-use households.
Tank water heaters
- Watch for rust, moisture, unusual noises and signs of leakage around the tank and piping.
- Sediment can collect in the tank. Flushing frequency varies by manufacturer and local water conditions.
- Many tanks use a sacrificial anode rod that eventually wears out; replacement timing varies.
- Combustion, venting, burner condition and safety controls should be evaluated by a qualified technician when applicable.
Tankless water heaters
- Mineral scale can reduce heat-transfer performance, especially with hard water.
- Many manufacturers call for periodic descaling or flushing; frequency depends heavily on water hardness and use.
- Air-intake screens, condensate components, burners and venting may require inspection or cleaning depending on model.
- Error codes, temperature swings or repeated shutdowns are reasons to service the unit rather than repeatedly resetting it.
How often?
Several times a year: look for leaks, corrosion, unusual sounds or error messages.
About annually: review the manufacturer's service schedule and arrange professional maintenance when recommended.
More often: hard water, high household demand, older equipment, visible scale or manufacturer-specific requirements may justify shorter intervals.
Call for service when you notice
- Water around the appliance or relief piping
- Rust, corrosion or discoloration
- Unstable hot-water temperature
- Repeated fault codes or shutdowns
- Rumbling, popping or other new noises
- Combustion odors, soot or venting concerns
General educational information only. Water heaters involve electricity, fuel gas, combustion, hot water, pressure and venting. Do not disable safety devices. Follow the manufacturer and local code requirements, and use qualified professionals where required.