This is what a proper navien install looks like! r/Plumbing

Navien External Recirculation. NPEA2 Series Series Navien 1) Two way valve set to external 2) Dip switch 1: on 2: off (making it look like internal recirculation) 3) Parameter 17 set to on- "Enable thermal bypass valve". The Navien NPE-210A2 installer manual (under 'External Recirculation', (p 84) says: "A2-type models must be set to use an external pump"

There are recirculation valves available from various manufacturers including Navien, Watts, Taco and Grundfos * The "cold-water sandwich effect" is the undesired introduction of cold water into.

Navien 240a Recirculation Diagram

One day, no hot water with fault code on the display Recirculate temp in is 67, temp out when just recirculating is 67 With the NPE-A2 unit's built-in pump, water circulates through the NaviCirc to preheat the hot water lines, using the cold supply line as the return line back to the water heater.

Navien Npe240a Recirculation Settings. To prevent the cold lines from becoming excessively warm, the thermostat control within the valve will stop recirculation flow once the hot water arriving becomes ~100 degrees Customer: I am just looking to understand internal vs external recirculation with navien tankless water heater

Residential Recirc setup with Navien NPE A for faster hot water. I was reading the directions, and it wants me to set the Heater to External recirculation I'm going to install the Navicirc tomorrow when i have a few minutes