Piping Mutiple Navien NPE-A2 unites with first in last out and circulation

As I have said in previous videos how important it is to pipe multiple tankless heaters with first in last out and I do receive a bit of questions on it, this week a lot I received no less then 15 messages on it.
This video I included piping in the circulation line to the unites.
Please make sure you install a three-piece valve kit; it makes you installation neater and will greatly help you service the unites.
The third valve on the circulation line will also help you isolate the circulation line when you also install a bleeder valve to bleed the line.
I only use the Navien valve kits on either the NPN or the NPE unites.

Plumb easy valve kit 3-valve set# Gxxx002140
Plumb east valve kit 2-valve set #Gxxx002139
They even have a pipe cover valve kit #30012581A
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Mike
PLEASE USE A LICENSED PLUMBER TRAINED IN NAVIEN LEVEL THREE TRAIN. FOLLOW ALL LOCAL AND NATIONAL PLUMBING AND GAS CODES AND TO FILE A PERMIT AND OBTAIN AN INSPECTION WITH YOU LOCAL BUILDING DEPARTMENT.

Видео Piping Mutiple Navien NPE-A2 unites with first in last out and circulation канала That Tankless Guy