Navien™ NPE-180A2 150,000 BTU Condensing High-Efficiency Tankless Water Heater

This A2 model is rated at 150,000 BTU and carries a recirculating pump, which puts it in homes where the wait for hot water at a distant fixture is the complaint. Condensing operation keeps flue temperatures low enough for SCH 40 2-inch venting up to 75 feet, and emissions sit at 20 ppm NOx.

Dual stainless steel heat exchangers do the heating. A half-inch gas pipe covers runs to 24 feet, and the gas system converts in the field. Controls are the EZNav multi-line panel with a HotButton. Packed alongside the heater: a conversion kit, a wall mounting bracket, four tapping screws and anchors, two 2-inch vent termination caps, and four 2-inch wall flanges. Residential warranty runs one year labor, five years parts, fifteen years heat exchanger.