Prepare water heater for cleaning
- Switch off your tankless water heater, then unplug it.
- Shut the water inlet and outlet valves.
- Place a large bowl or basin below the service valves leading to the heater. Open the valves and remove their end caps with channel lock pliers.
- Allow any water in the heater to drain into the bowl.
Article source here: How To Clean a Tankless Water Heater
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