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Typical venting for high-efficiency wall-hung boilers?
I currently have a gut/rehab underway on 3rd floor of a building. In the next phase we may be adding a high-efficiency boiler on second floor. With everything open above 2nd floor up to the roof now, it would be very easy to add vent pipe to be connected to the boiler in the future. Is it possible to take a good guess at vent requirements, and what would those be? Possibly 3 or 4" PVC for intake and exhaust? We are not ready to make a boiler selection now.
In this phase we added a tankless water heater and in researching it, typical models (but not all models of course) use 3 or 4" PVC. If we could make a best guess on the boiler venting now, it may save us a whole lot of trouble and expense in the next phase. Any thoughts?