You generally need to follow the following steps to flush your hot water system.
- Turn off power: If you have a gas hot water system, set it to the “pilot” position. For electric systems, switch off the power at the circuit breaker.
- Shut off water supply: Close the cold water inlet valve to the hot water system. It’s usually located near the top of the system.
- Connect a hose: Attach a garden hose to the drain valve at the base of the hot water system. Position the other end of the hose where you can safely discharge hot water and sediment.
- Open a hot water tap: Open a hot water tap in your home to prevent a vacuum from forming in the lines as you drain the hot water system.
- Drain the hot water system tank: Carefully open the drain valve on the hot water system by turning it counterclockwise. Allow the water to flow out until it runs clear. This will remove sediment and mineral buildup from the bottom of the tank. Be cautious, as the water may be hot.
- Flush the tank: If the water coming out is still murky, close the drain valve and open the cold water supply valve for a few minutes to agitate the sediment. Then, repeat the draining process until the water runs clear.
- Close the drain valve: Once you’re satisfied with the clarity of the water, close the drain valve by turning it clockwise.
- Refill and turn on: Turn on the cold water supply valve and allow the tank to refill. Keep the hot water tap open until a steady stream of water flows, ensuring that air is purged from the system.
- Turn on power: If you have an electric hot water system, switch the power back on at the circuit breaker. For gas hot water systems, reset the control knob to the desired temperature setting.
- Check for leaks: Inspect the drain valve and connections for leaks. Tighten any loose connections, if necessary.
Alternatively, your plumber can do this at your annual hot water system service!