In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
MZ Boiler Knocking Noise Steam Venting Overheat?
I woke up this morning to a loud knocking noise from the burner. Model is a MZ 25S. Water temperature was nearing max temperature and steam was venting to the outside of the house. It's 80 C now in the summer months so I don't know why steam would vent to the outside like that. Condensation during the winter would make sense. Something isn't right.
Anyone have any ideas what would cause this knocking noise and steam venting to the outside of the house?