I want to move my heater 15' from where it is now on the same side of my garage wall. The plumbing comes out of a sheet rock framed wall however the rest of the garage is block construction. I plan to run the cpvc lines down the block wall and insulate the hot water line. My question is can I do the same for the release valve drain? I figure I can as long as the drain line is lower than the top of the heater.