A light dose of clorox and water will clean out the tankless water heater but make sure it is OFF and not heating!. Just run it through slowly to pick up anything in there and flush it out.
In all reality the water gets so hot in there and the velocity of it going through all you really have to do is run the heater clean water, let it heat up and run a few gallons through and anything living in there will be long gone.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
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