NPE150S2

The Navien NPE S2 series is a premium condensing tankless platform built for efficient, on-demand domestic hot water with a clean, code-true install.

 
NPE150S2 is typically a practical fit for smaller Ottawa homes, condos, or lower simultaneous-demand setups where you’re not trying to run multiple high-flow fixtures at once. It’s also a sensible pick when mechanical space is tight and you want tankless performance without oversizing the gas and venting requirements.

 
The main pitfall with this size is expecting “whole-house peak demand” performance—especially in winter when incoming water is colder and GPM effectively drops at higher temperature rise. We verify your real fixture flow rates, the gas supply capacity, the venting route, and the service/flush valve layout so the system performs the way you expect.