A. O. Smith’s breakthrough X3 Scale Prevention Technology ensures uninterrupted functionality, eliminates the need for scale-related maintenance and extends the lifespan of tankless units three times longer than unprotected units.

The new NPN will be offered in two series, the NPN-U (universal) and NPN-E (exterior), both of which will be available in 160,000 Btu/h, 180,000 Btu/h and 199,900 Btu/h models for either natural gas or liquid propane.