radiant heat question

sean_26

i'm putting in a radiant system in my house.the house is 2500sqft not including 1000 sqft basement that i want to finish next year.i have a choice between two boilers.G124 Buderus btu132 with electronic damper with and indirect water heat .....or rbn180-fi lochinvar with and electronic damper with and indirect water heater...i was also considering bradford white water heater 75 gallons,75000btu for a heat source?because it's cheaper.can you draw a mechancial drawing for my problem?winter just around the coner