You should flush your hot water tank once every 6 months. If your local water is harder or contains more minerals, you may need to do so on a more frequent basis. At a minimum, drain 1 to 2 gallons of water from the drain valve monthly.
Follow these steps to flush your water heater:
- On a gas water heater, turn the gas valve to the off position. On an electric water heater, turn power off to the heater (located in electrical panel marked water heater).
- Shut the cold water off to the water heater.
- Open a hot water faucet.
- Connect a hose to the drain valve on the heater and run to a drain.
- Open the drain valve and allow the tank to completely drain.
- Turn back on the cold water into the water heater.
- Allow the water to run through the water heater and out of the drain valve. Do this for approximately five (5) or ten (10) minutes.
- Close the drain valve and allow the tank to refill, keeping the hot water faucet open. When water comes out of the faucet, the tank is full.