Step-by-Step Water Heater Maintenance Checklist for Arizona Homeowners

Step 1: How to Safely Flush Your Water Heater Tank

Flushing your tank purges calcified mineral sediment before it bakes into solid rock:

• •Turn off power to the water heater (shut off circuit breaker for electric models; turn gas valve to 'PILOT')
• •Shut off the cold water inlet valve on top of the heater
• •Attach a heavy-duty garden hose to the brass drain valve at the base of the tank, running the opposite end to an exterior drain or driveway
• •Open the drain valve and open a hot water faucet inside the house to break vacuum suction
• •Allow the tank to drain completely; then open the cold water supply valve in short bursts to stir up and flush remaining sediment until the water runs completely clear
• •Close the drain valve, disconnect the hose, refill the tank completely with water, and only then restore power or relight the burner

Step 2: Testing the Temperature & Pressure (T&P) Relief Valve

The T&P valve is your water heater's primary safety device, designed to open automatically if internal pressure exceeds 150 PSI or temperature exceeds 210°F.

Lift the small metal test lever briefly. Water should discharge rapidly into the drain pipe. Release the lever; the valve should snap shut and stop dripping immediately. If it continues to leak, replace the valve immediately.

Step 3: Checking the Sacrificial Anode Rod

Turn off water and relieve tank pressure. Use a 1-1/16" socket wrench on the hex nut on top of the heater to unscrew the anode rod.

If the rod is coated in thick calcium crust or worn down to its thin center steel core wire, replace it with a new magnesium or aluminum anode rod immediately.

Step 4: Annual Descaling for Tankless Water Heaters

Tankless water heaters require annual descaling to remove mineral scale from the copper or stainless steel heat exchanger. Close the service isolation valves, connect a submersible utility pump to 4 gallons of food-grade virgin white vinegar, and circulate the vinegar through the unit for 45 minutes to dissolve calcification.