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a few of our apartments have been getting surges of hot water out of our cold tap when the oil burner tuns on to heat the hot water for the building. The heating company says it isn’t the boiler, and they have come out to look at it and said that there is nothing wrong with the coils or the boiler itself. He suggested that there might be a worn washer and we need a separate plumber. I was going to get a plumber that specializes in heating systems.

Any recommendations? Does it make sense that it may not be the boiler? If the plumber finds fault with the boiler, do we go after the the heating company under our contract?