Flushing a Rinnai tankless water heater is a simple but important maintenance task that can help to extend the life of the unit and prevent costly repairs. It is recommended to flush the water heater at least once per year, or more often if the water in your area is particularly hard. Flushing the water heater will remove sediment and scale buildup that can accumulate over time and restrict the flow of water. This can lead to reduced water pressure, higher energy bills, and premature failure of the water heater.
To flush a Rinnai tankless water heater, you will need a garden hose, a bucket, and a flathead screwdriver. First, turn off the water supply to the water heater and open a hot water faucet to release any remaining pressure. Next, attach the garden hose to the drain valve on the bottom of the water heater and open the valve. Allow the water to drain into the bucket until it runs clear. Once the water has stopped draining, close the drain valve and turn the water supply back on. Finally, open the hot water faucet again to purge any air from the system.
