Hi, I am brand new to this forum. I am looking to replace my 40 yr old oil fired boiler with a new boiler. My choices are fuel oil or propane. The old boiler dates from the original 900 sq ft slab on grade with double stack fin tube baseboar heating (circa 1965). I have increased the original footprint with radiant floor and a second floor with slant fin 30 baseboard. The house is now 2300 sq ft and I use the same amount of fuel oil as I did before the add-on (1000 gals fuel oil). Highly insulated and very tight.
My heat load calculations come out to 42-45,000 btu/hr on a 0 degree day (I live in southern michigan, use Lansing HDD). Total fin tube emitters equals 102 lineal feet. Radiant floor heat equals 450 sq. ft with tubing on 6 inch centers.
My contractor is quoting a Lochinvar 080 Knight ModCon propane. He is basing his boiler size on my potential radiation, says heat load is secondary. I think the boiler is oversized. Am I wrong in thinking that this will negate the ModCon efficiency? I have heard good things about Lochinvar, especially concerning parts availability inMichigan. I initially was going to stick with oil ( I have no problems with oil). Was looking at American Std, Utica and crown. Looking for comments. I am big on efficiency and am very handy. What about Indirect DHW? I currently use electric DHW tank.