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I would suggest you go back to 2010-2011 and get yourself educated as to what Navien was offering in that time period. Back then the non ASME Verison of the CH Series was being installed and passed on as a combination boiler which at that time did not have a AFUE rating nor was it subject to any utility rebates as a boiler. It also did not have an AHRI number. Nor does it have one now as far as a boiler is concerned.
If you want to keep going back to posts 2-3yrs old and continue to say myself and others are providing bad information I suggest you get your facts straight. It wasn't until Aug-Sept of 2012 that Navien stopped offering the NON ASME version of it's CH Series.
You have been running around on every post concerning Navien some 3 years old in some type of intent to discredit and wondering why?
"The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."