I have a 3000sq ft 4-story brownstone, need to replace 175Kbtu gas water boiler (cast iron radiators). Want to go high efficiency but my contractor is saying these need to be vented on very short runs and maybe not vertically, or they cause problems? Current boiler vents from basement all the way to the roof. He also doesn't like the reduction in water from 20 to 5 gallons due to pressure? He wants to do a Slant Fin at 84% AFUE, I was hoping to get in the mid-90s. Any thoughts would be appreciated.
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