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The Navien NPE-180A2 is a condensing tankless water heater with a 10,000–150,000 BTU modulating burner and a 0.95 Uniform Energy Factor. It pairs dual stainless steel heat exchangers with a built-in recirculation pump, so hot water arrives faster and the unit can serve several fixtures at once. It hangs on a wall indoors or outdoors, converts between natural gas and propane in the field, and can cascade with up to 12 units for larger loads. Against basic tankless models it adds recirculation, common venting and cascade support, which makes it a stronger fit for whole-home and light commercial work than a bare single-unit heater.
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Owners and installers generally rate the NPE-180A2 well for steady hot water, quiet operation and the built-in recirculation pump.
The Navien NPE-180A2 is a condensing tankless water heater for residential and light commercial use. It has a Uniform Energy Factor of 0.95 and an input range of 10,000 to 150,000 BTU per hour. It delivers 8.4 GPM at a 35°F temperature rise, enough for several hot water demands at once.
It has dual stainless steel heat exchangers and a built-in recirculation pump. The ComfortFlow system combines a buffer tank, the recirculation pump and fine-tuned controls to address the cold-water sandwich effect, which is cold water entering the hot line during frequent on/off cycling. The pump can recirculate through an external recirculation line or through existing supply lines using NaviCirc, with no external pumps or controls.
The unit is wall-hung for indoor or outdoor installation. It can be converted in the field between natural gas and propane. The EZNav multi-line control panel includes the HotButton interface. Units can be cascaded or common vented, up to 12 together.
