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That is totally unacceptable.Who the hell makes boilers with out testing them . The cross tubes are inside the flue which is inside the boiler .There is no easy fix for that The central flue and cross tubes should be hydraulic tested before inserting in the boiler shellThey should be sending another one promptly and paying you to send the dud back CheersDennis
Ahh jeez that's a major bummer John I've had a lot of dealings with MSM over the years and I'm sure that they will look after you.My MSM 4" boiler is terrific.