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The Navien NPE-240S2-NG is a 199,000 BTU condensing tankless water heater built for large homes and heavy hot-water demand. It delivers up to 11.2 GPM at a 35°F rise and runs at a 0.96 Uniform Energy Factor, so it handles several fixtures at once while wasting little heat. The stainless steel heat exchanger, 2-inch PVC venting up to 75 feet and 1/2-inch gas pipe capability up to 24 feet make retrofits easier than many rivals that demand larger gas lines or stainless venting. It suits households replacing a tank or upsizing for multiple bathrooms; buyers should weigh the higher upfront cost and annual descaling against a tank's simplicity.
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Owners of the NPE-240S2 generally report steady hot water for multiple fixtures and straightforward installs thanks to the 2-inch PVC venting and small gas line. Complaints center on maintenance and service rather than output.
The Navien NPE-240S2-NG is a condensing tankless water heater with a heat input of up to 199,900 BTU/h. The flow rate is up to 11.2 GPM at a 35°F temperature rise.
It vents through 2" Schedule 40 pipe for up to 75 ft and can run on a ½" gas pipe up to 24 ft. NOx emissions are 20 ppm.
