Water Heater Maintenance Checklist For Arizona Homes

Why The Standard Schedule Is Not Enough Here

Manufacturer maintenance intervals assume average water quality. Arizona's mineral load is well above average, so sediment accumulates faster and anode rods are consumed sooner than the manual anticipates.

Following the printed schedule in the Valley usually means arriving at the tank's failure point several years early. Our recommended schedule is more frequent and the difference in equipment life is substantial.

Annual: Flush The Tank

Flushing removes the mineral layer that insulates the burner from the water and eventually cracks the tank lining. It is the highest-value annual task on the list.

The process: shut off power or gas, close the cold inlet, attach a hose to the drain valve, open a hot fixture to break vacuum, and drain until the water runs clear. Refill fully before restoring power to an electric unit — dry-firing destroys elements instantly.

If you have no water softener, do this twice a year. Homes on well water may need it even more often.

Every Two To Three Years: Inspect The Anode Rod

The anode rod corrodes so the tank does not. When it is consumed, the tank becomes the sacrificial element and the countdown to failure begins.

In Mesa, Gilbert and Chandler water, an anode can be fully depleted in three to four years. Inspect at year three and replace when more than half the core wire is exposed. This single item can add five or more years to a heater's life.

Annual: Test The Relief Valve

The temperature and pressure relief valve is the appliance's primary safety device, protecting against catastrophic tank rupture.

Lift the test lever and allow a short discharge into the drain line, then release. It should stop cleanly. A valve that continues dripping afterward has debris or corrosion on the seat and should be replaced — not plugged, not ignored.

Annual: Verify Pressure And Expansion

Measure static water pressure at a hose bibb. It should read between 55 and 70 PSI. Above 80, a pressure reducing valve is required by code and by common sense.

If your system has a pressure reducing valve or check valve, it is closed and requires a thermal expansion tank. Verify the tank's air charge matches incoming water pressure; a waterlogged expansion tank offers no protection at all.

Tankless: Descale Every Twelve Months

Tankless units have no tank to flush, but their compact heat exchangers scale rapidly in hard water. Annual descaling circulates a food-grade solution through the exchanger to dissolve mineral buildup.

If your unit was installed with isolation valves, the process takes under an hour. If it was not, we recommend adding them during the first service — it converts an awkward job into a routine one for the life of the appliance.