Before you settle on the KAA-2 make sure that's the boiler that will handle your needs. What is the sq. ft. of your house, how many gals. of oil do you use per year. Do you plan on finishing the basement, heating the garage or adding any additions in the future, if so the KAA-2 might not handle the extra space. The KAA-2 is a good boiler but it only has a 100lb hopper, you'll be filling it every other day and it has a smaller blower motor.