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Biasi B-10 Series of Boilers is the best choice for Low Mass-Triple Pass Cast Iron Boilers. With the AFUE just under 90%, Biasi has made a terrific boiler. By holding only a fraction of water compared to other boilers your Biasi will run for a fraction of the time. This is where the savings really comes from. With less water in the boiler there is less run time on the burner. When your burner isn’t running you are not burning oil! Get it? Biasi has been Parkside’s choice for this style of boiler for 15 years and the track record speaks for itself. This is a fine boiler.