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Weil HE common venting....
I did a service call on a 27 +/- yr old Weil Mclain HE-4 Nat gas boiler. Power vented. It was vented in 3" galvy sheetmetal into a 5" B-vent chimney. Also vented into the B vent was a 40 gallon std. atmospheric water heater. Boiler is in good shape. What bothered me is that I didn't think you could put a power vented unit into a common chimney w/ a std vent appliance. I looked at the brochure from 30 years ago and it says that this is acceptable... that is news to me...Or so I thought. Your thoughts? I am probably going to suggest a new indirect water heater.