I plan on installing a Weil Mclain AquaBalance WMB-80 natural gas combi boiler for h/w baseboard and domestic hot water use in my 2 story total 1440 sq. ft. addition. The installation instruction seem a little confusing saying either a 2 inch or 3 inch vent/air supply separated is acceptable. Has anyone installed one of these/or similar units and can I get away with a 2 inch PVC piping, total length and adjustments for elbows being less than 55 feet.
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