I had a Navien on demand in line hot water heater installed about 4 years ago; it's a piece of junk. Run away from this brand. One plastic elbow failed in about 4 months, then a metering turbine failed, got replacements part and replaced it. A few months later this part failed again and they replaced the unit, had changed slightly in the mean time so had to adjust plumbing hook ups, thanks guys.
Now a temperature well corroded through in about 2 years and I'm fixing it again. Reliability is terrible, I'm going to fix it so I have time to research a tank style model to replace it with. No savings when you consider breakdown frequency. Should never have been sold with this level of reliability.
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