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hi,on the mpo -iq burnham series in the catalog there is a box with boiler ratings.mph ,ibr and burner capacity.burner capacity is .60gph to 1.65 gph what do the burner capacity numbers mean..oil co. said i should go with mpo-iq147 ibr 112 with 35 gallon superstor,burnham rep said mpo-iq84 ibr 84 was big enough with alliance 35 gallon.apt connected to side of house 400sqft will be radiant. remaining house cast iron rads (2200sqft)4 zones.what size boiler makes more sense?thankyou.