Navien tankless water heaters, boilers, and combi-boiler with water tube heat exchangers have a generally good reputation. Now the bad news...
There appears to be high failure rates of the exhaust vent gasket at the sheet metal under the vent collar, and failures the combustion chamber seal at the heat exchanger. I'm not normally an alarmist, but this is both a safety and reliability concern. If you've ever opened up the unit to see oily film on things, it's either this type of failure,...
If you own, install, or service Navien equipment...
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