110,000 BTU Modulating Gas Furnace 97% AFUE vs Navien NPF Hydro-Furnace

The Navien NPF is the more flexible pick for most homes: it modulates down to 14,000 BTU/h, ships with LP and high-altitude kits, and has an adjustable discharge temperature and EZNav control. The 110,000 BTU furnace is the bigger, simpler machine, with a self-calibrating gas valve, silicon nitride igniter and Bluetooth, but it needs a separate propane kit and tops out higher on heat output. Both are 97% AFUE condensing units; owners of modulating furnaces praise steady heat and quiet variable-speed blowers, while the trade-off on both is a more complex, service-sensitive install than a single-stage furnace.

• Choose the 110,000 BTU modulating furnace if you have a large, cold-climate home that needs high heat output and you want a conventional upflow or horizontal install with a self-calibrating gas valve.
• Choose the Navien NPF if you want a compact modulating hydro-furnace with a wide turndown, built-in LP and high-altitude kits, and an adjustable discharge temperature for zoned or ducted systems.