Hi! Going with a new Biasi B3 or B4 (3.3 and 4.7)gal water respectfully to replace my old boiler. My final baseboard sizing is not complete as I am replacing some of my old baseboard with the "Senior" 700 btu sections. My question has to do with boiler insulation. The Biasi appears to have about 2" of the standard yellow fiberglass insulation around the boiler. I have noticed some other models that have rigid foam insulation. Can some one explain the insulation factors to me, and can the amount of insulation be increased? Thanks, Bill