How to Drain and Flush Your Water Heater

Sediment is the silent enemy of your water heater. Over time, minerals from your water supply settle at the bottom of the tank, creating a layer of scale that acts as an insulator between the heating element or burner and the water itself. Left unchecked, this buildup can cause popping noises, uneven water temperatures, and premature tank corrosion. Performing this maintenance once a year keeps your heater running at peak performance. When done correctly, the process is straightforward and results in a clean tank that works harder for you with less energy usage. It is the single most effective way to ensure your hot water remains reliable throughout the year.

1. Kill the Power First. Turn off the power to an electric water heater at the circuit breaker. For gas heaters, turn the gas control knob to the Pilot setting or the Off position.
2. Lock Out the Cold Line. Close the cold water supply valve located on the pipe feeding the top of the heater. Ensure the handle is turned completely to the closed position.
3. Route the Escape Path. Attach a standard garden hose to the drain valve located at the bottom of the heater. Run the other end of the hose to a floor drain or out to the driveway.
4. Unleash the Tank. Open the drain valve using a flat-head screwdriver or the built-in handle. Allow the water to flow until the tank is completely empty.
5. Stir and Clear. Briefly open the cold water supply valve to stir up any remaining debris at the bottom. Repeat this cycle until the water running through the hose is clear.
6. Bring It Back to Life. Close the drain valve, disconnect the hose, and turn the cold water supply back on. Once the tank is full, turn the gas or electricity back on.