Hot water loop off of steam boiler and a Spirovent.

maybedave

Hi,

We have a hot water loop off of a steam boiler that is getting air in it.  I called a plumber and he installed a spirovent.  After speaking with other plumbers I am told that the spirovent should not be on the hotwater loop because it can put air back into the loop.  Can someone please confirm this is the case?  The mixed answers are confusing me.

Charlie from wmass

It depends on how the system is piped

If the hot water loop is using the boiler water directly then no Spirovent. If the system is using a heat exchanger that allows the system to be pressurized then yes Spirovent. Photos please.