Roback
Member
I have a water heater in a closet with an exterior wall. Never had a discharge tube. Just a pan with outside 90. Having the house re stucco and want to install outside 90 from the TRV. Small closet so trying to avoid soldering inside room! Also, I want to make it easy to remove if get a new heater so thinking of using dielectric unions on valve as well as on vertical and nipple that can run to outside 90. Is it okay to use unions for this? If so, other than at valve which I imagine I would use Teflon, would I use dope on the other unions? Would I be better off using CPVC? Also, the 90 would be about 18 inches or so off ground outside like Pan discharge, as heater inside is on a platform. Any advise appreciated.