Compared across 3 stores. Prices are checked against each store and labelled with when.
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The Navien NPE-240S2 is a condensing tankless water heater rated at 199,900 BTU/h and up to 11.2 GPM, with a 0.96 UEF that puts it among the most efficient gas units sold. Its dual stainless steel heat exchangers and ½-inch gas pipe capability up to 24 feet simplify retrofits where upsizing the gas line would be costly. It can be installed indoors or outdoors and carries Energy Star and CSA certification. It suits larger households and buyers replacing a tank who want near-condensing efficiency and flexible venting, though it needs a 120V circuit and proper gas sizing to perform as rated.
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Lowest price we've seen: $538.25 on Nov 9 at Goallo. Tracked across 3 stores since Nov 9.
Owners of Navien condensing units generally report strong, steady hot water and lower gas use, and installers favor the flexible gas and venting options. Complaints center on maintenance and on performance when the gas supply or water hardness is not addressed.
