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Water company over pressured my home
A couple of months ago the water company over pressured my home .. significantly. There were multiple main line pipe breaks in the neighborhood, current count is 7.. Even with a 300psi rated PRV (that still functioned properly after incident) installed at the utility connection this burst my water filter housing and the 1" Type L copper pipes leading to my water heater are ALL now seeping at every solder joint .. where there were zero leaks before for the past 3 years. Just before the filter housing burst, my tankless water heater's restriction valve was caviating , attempting to hold back the water and both of the pressure safety valves were releasing water. The water heater is capable of 120k BTU and 6 gpm max at the water inlet temperature set at 120deg F. The safety valves are in series (the 2nd in a small inline tank water heater) both rated at 150psi, one is CSA rated at 200k BTU the other at 105K BTU. Can someone help me determine approximately what minimum pressure it would have taken to drive 6+ gpm through these valves? And if I had this pressure on the low pressure side of the PRV, what would the minimum pressure be on the utility side?