Steam Boiler - water leaving the boiler, going up the main

John_119

We have a steam boiler that is pushing water up the main when on a call for heat.This is a existing boiler ( 8 yrs.); it also has a hw loop for another zone. This zone is not calling when hh lose's water,
Suspect a blocked return! Any idea's ?

Al Letellier_9

steamer trouble

If water is rising in the main, it can be due to a blocked return, or more likely improper near boiler piping. If the riser out of the boiler is not properly sized, or the header not built correctly, or no header at all, this could lead to your problems. What are the symptoms? How do you know water is rising in the main?

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