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Message: [QUOTE="The Funster, post: 3693772, member: 831"] I worked for an HVAC contractor for over 30 years and now work for an HVAC wholesaler. I don't sell the Navien but it seems to be the best of the bunch right now. Personally, I would stay away from them. They seem to have an effective lifetime (around 10 years) which is short for such a steep investment. You can go with a standard size high efficiency boiler and have much better reliability, IMO. [/QUOTE]