The Navien NPE-S2 is one of the most popular condensing tankless water heaters on the market, and for good reason. With a Uniform Energy Factor up to .96, it outperforms much larger non-condensing competitors while costing less to operate. Available in four sizes from 120,000 to 199,000 BTU, the NPE-S2 fits everything from condos to large family homes. Dual stainless steel heat exchangers resist corrosion for a longer service life, and 2" PVC venting up to 75 feet keeps installation costs down. Field convertible between natural gas and propane, with an intuitive EZNav control panel for easy setup and diagnostics.

Dual Stainless Steel Heat Exchangers: Corrosion-resistant design extends service life up to 20 years and maintains peak efficiency even in hard water conditions.

2" PVC Venting Up to 75 Feet: Low exhaust temperatures allow use of standard PVC, CPVC, or polypropylene venting, reducing installation cost and complexity compared to metal vent systems.

EZNav Control Panel: Backlit display with simple text and icons shows temperature, water flow rate, and self-diagnostic codes for fast troubleshooting and easy setup.