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(pix) Is this correct? Exhaust on Steam Boiler passing air 24x7 in winter?
Big Heat Loss through steam boiler vent?
I have a 1920 built house with steam heat (one pipe).
It just occured to me that during the winter, even when the boiler is off, relatively warm basement air is racing up the chimney through the boiler exhaust vent 24x7, even when the boiler is not cycled on. Is this right? If so, this is a big loss of heat in the basement. Is there anything I can do about shutting off this exhaust vent until when the boiler cycles on? Also I notice on the bottom of the rectangular box (in the picture), it is open, is that normal?
See pictures on this link: