Today I came to Peter’s Glengarry home to evaluate the basement under slab heating system. Peter has explained that the axiom hydronic feeder will not hold water. He has to fill it up repeatedly and it empties in a matter of minutes. Upon inspection I found it was empty. I filled it up and it emptied in approximately 5 minutes. This means there is a leak in the system. As I can see no leaks above ground, the leak must be under the slab. Isolation valves must be added to the supply and return lines to find the leaking loop. Then you can choose to not use that loop, or perform further diagnostics. To determine where the leak is. Peter will discuss the repair with Marisa and will let us know how he chooses to proceed next week.