You guys are amazing... THANK YOU !! Today is a tough day for me...need to take care of grandmother 96 years young!! I'll check in later tonight and answer any questions listed...pipe size..etc. Note: loop pipes go from front yard through 2ft floor trusses to the back of the house. In one of the last pics (under the 2 units near the floor) is where the loop pipes connect to more tubing - pump-units. This is the only way I know to access the actual loop line besides digging up the front. Hopefully we can fix or even improve the flow and temps by re-plumbing again. THANKS!!