To flush a water heater, follow these key steps:
- Turn Off the Power or Gas Supply
- For electric water heaters, switch off the power at the breaker box.
- For gas water heaters, turn off the gas supply valve and set the thermostat to "off" or "pilot" mode
- Turn Off the Cold Water Supply
Locate the cold water valve at the top of the water heater and turn it off to stop water from entering the tank
- Open a Hot Water Faucet
Open a nearby hot water faucet (sink or tub) to relieve pressure and allow air into the system, which helps the tank drain properly
- Attach a Garden Hose to the Drain Valve
Connect a garden hose to the water heater’s drain valve (usually near the bottom of the tank) and place the other end in a safe drainage area such as a floor drain or outside
- Drain the Tank
Open the drain valve and let the water flow out through the hose. Allow it to drain completely or until the water runs clear, indicating sediment has been flushed out
- Flush the Tank
After draining, turn the cold water supply back on briefly while keeping the drain valve open. This flushes out remaining sediment. Continue until the water runs clear
- Close the Drain Valve and Refill the Tank
Close the drain valve, remove the hose, and turn the cold water supply back on to refill the tank. Once full, turn off the open hot water faucet
- Restore Power or Gas Supply
Turn the power back on at the breaker or relight the pilot light and turn the gas back on. Adjust the thermostat to the desired temperature
This process removes sediment buildup that can reduce efficiency and lifespan of your water heater. Flushing annually or as needed based on water quality and heater performance is recommended
. For tankless water heaters, the flushing process involves using vinegar or a special cleaner and may require a pump to circulate the solution through the system
. Following these steps will help maintain your water heater’s performance and prolong its life.
