Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
This is embarrassing to ask. Getting ready to connect the DHW, on our E50C and nowhere in the manuals can I find the max cold water supply pressure for DHW. After all the pressure concerns with the boiler/radiant side the manuals are silent.
The only clue I can find is Rinnai requires a 150psi pressure relief valve on the DHW hot side. The manual does tell what to do if the water pressure is below 22psi. I have a watts PRV that we are planning to install and would like a clue as to what pressure to set it. We are on a rural water system with wild swings from 80 to 120 psi.