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We are looking at installing two Burnham gas-fired High Efficiency, Condensing Boilers in a gut renovation. Basement, Floor 1 Apt and Floor 2 Apt. I want to “stack” in FL1, FL2 utility closet a unit to handle each independent apartment – in the apartment. So one unit directly over the next one floor up. Question is venting: I know codes and manufacturer specs regarding venting. However, nowhere does it say how close to each other the vent stacks can be on the roof. I hope this makes sense. Question 2: should I just put the units in the basement? But same issues applies…how close on roof can the vents / intakes be to each other?? Any wisdom would be appreciated.