On my very recent Navien NPE210A install, the plumber installed a check valve on the cold line - See attached pic. Reading the different posts, I believe that a check valve is required on the T going to the recirculating pump? Is this correct?
Navicirc is installed, as there is no dedicated return line.
Thank you in advance.
Navicirc is installed, as there is no dedicated return line.
Thank you in advance.