In the 6 years I have been doing inspections this is only the third on demand water heater I have come across.
I noticed a couple things wrong with the TPR valve discharge piping. I noticed there is a small leak at one of the connections, there are 4 elbows in the discharge pipe, and TPR valve drain should be independent of any other plumbing…
I thought I would share to see if anyone could explain to me what the braded line was for that is tied into the TPR valve discharge piping?
The braided line is the hot water output from the water heater. Technically, that is only a pressure relief valve, not a TPR on a tankless unit. Not sure what you mean about the valve should be independent: The discharge should have no "T"s, but it is typical for the pressure relief valve to be installed at the hot water outlet of a tankless water heater, though they did a pretty crappy job of that one. Download the installation manual and review the specifications for the valve placement there. It’s a listed device.
