Navien NPE-A and NPE-S units replace inefficient tank heaters, saving water, natural gas and electricity. They provide an endless supply of hot water, they have lower maintenance costs and enjoy a longer product life. Installers can cascade up to 16 units in side-by-side or back-to-back configurations (wall or floor mounted) with the Ready-Link Manifold System.
The Navien NPE Series sleek, wall-mounted tankless water heaters occupy 80% less space than traditional 50 gallon tank water heaters. These compact tankless units can also be installed in cabinets or small closets unlike bulky tank water heaters.
Unlike systems that waste energy to heat large tanks of water, Navien tankless units utilize .98¢ of every $1 to heat your water. Unlike a conventional tank system, it only fires up when hot water is needed allowing great utility savings and a lower impact on the environment.

What are the differences between NPE-S vs NPE-A?
The Navien NPE tankless water heater is available in two models, the S (Standard) and the A (Advanced). The difference between the two is the inclusion of a buffer tank and recirculation pump on the A (Advanced) model. The Navien NPE-A models have the built-in ComfortFlow® system which eliminates a sudden blast of cold water during your hot shower, also known as “shower shock” cold water sandwich. This issue is common on many competitor’s tankless water heaters.