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I have a triangle tube prestige 250000 btu condensing boiler that I installed about a year ago. It has several webstone ball valves and 2 heat exchangers. The boiler pressure is lower than the pressure on the other side of both exchangers. I have a small expansion tank on the boiler loop. I have a city line there with a regulator and a valve. I keep it turned off in general. About once a month the boiler shuts off on low pressure (about 8 psi i think) then I turn on the valve and get it back up to about 15 and it's fine. I understand this is adding calcium etc to the boiler loop and would like to find the leak but I don't know how. The boiler loop is 1 1/2 inch sweat copper. Thank you