Great information but we need to know the size of the discharge tube. Just make sure it is at lease 3/4".
You have 2 hot water heaters in the photos, one of them is in the garage?
My answers are based mostly on the ICC codes. Advice given is my personal opinion and every person performing work should acquire a permit from his/her jurisdiction and get the work inspected. My opinions are not directions to follow for DIYs or professionals
What's an accurate method to measure it? I thought it would be plainly written on the CPVC pipe.
Also, are you able to answer these?
- The water heater is in my garage. Could I have "overwraped" an already insulated water heater? Could this be the cause of my problem? Or, is there no such thing as over insulating a water heater?
- Can I simply forego the expansion tank and have a plumber install a normal valve?
I want to thank everyone for their advice. I spoke in-debth with MACPLUMB 777 about the need for attaching a thermal expansion tank.
Again, thank you kindly for your time and advice.
Sounds like you have it all worked out....but just in case: The T/P is a safety to prevent a catastrophic event if the Pressure exceeds the design max limit of the WH ( 150 PSI). But we do not want the house piping to regularly see pressures less than 150, but far exceeding the normal max limit of 80 PSI. That situation is caused by thermal expansion, and is accomodated by a thermal expansion tank, or your thermal relief valve.
I think "jar" still needs closure as to why the posted photos seem to negate each other.