I live in Canada and I am considering replacing my old Smarts furnace (1976) with a new oil furnace (AFUE 80-85%). According to the last service, the current furnace has an effiency rating of 79%. This seems high for a 30 year old furnace with an flue exit temperature at 450 - 500 degrees F. I think the furnace has reached the end of its life as soot is being noticed upstairs on the walls and around the furnace.
There are so many out there and so much information, I am getting confused. I just had an energy evaluation done with a design heat loss of 53835 BTU/H. How important is this when considering the size of a furnace ? The installer is suggesting a 77000 BTU/H to a 89000 BTU/H.
Which are the better and best oil furnaces ? I have been looking at the Newmac NL2 lowboy (84.8 AFUE) and Olsen BML lowboy (85 AFUE). Which is better ? Should the newer oil furnaces come with a barometeric damper as I was told that the newer furances do not or should not come with one ?
Is there any other information I should consider ?
I would appreciate any information or advice.