Ok, I gots me a problem and maybe some of the more plumbing savvy members here might chime in with some advice. It seems I have a hot water line leak under the concrete foundation of my house. I'm pretty sure it is the hot water line, as the outlet at the HW heater keeps running with all other valves closed. The HW runs out quickly, even with the tank full. I've contacted a plumber friend and he feels the same. Let's assume it really is as I've described. What alternatives do I have instead of breaking the foundation and repairing the line? Busting out the concrete will take some time, and significant expense, as well as possibly destroying the tile floor and shower surround, which is also tile. Thanks in advance!