What are the advantages of cast iron over steel in a pellet stove? It seems most stoves we have seen are steel. Also, we are not sure about the size of stove we would need. The first floor is mostly open floor plan, 1500 sq. ft., but the stove will be located in the furthest corner of the house, in a room with a lot of windows. We'd like to heat the first floor and also get a little residual heat upstairs without blasting out the family room in which the stove would be located. The ceilings are low (7.5 feet) and the house is a typical New England colonial style. If a stove claims to heat up to 2000 sq. ft., what is the real amount that it will heat - I imagine less in reality? Thanks.