big bang theory

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When a new boiler replaces an old inefficient one, they steam much faster than the old, which can leave less time to drain water in certain horizontal sloping pipes. Be sure the pressure is kept lower than 3 psig, the pipe that bangs has the proper slope, and the main vent(s) are good.

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Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.