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I'm converting to gas next month. My plumber quoted me the Navien CH180ASME due to limited space in the boiler room. Current Oil boiler supply both hot water and heat for the home. The home is 1100sqft with 2 heating zones. Is this unit sufficient for the size of the home? Please share any experience with this unit good and bad. Also are there any competitor's unit I should consider beside Navien? Thank you.