My oil furnace is 26yrs old & running fine right now.
The combustion chamber looks good-- the bricks are solid - the plenum was taken apart for a thorough cleaning last year & it looks good- and there is no rust on the outside of the furnace.
But I know something major will break one of these days [last problem was a limit switch 3 years ago- the air circulating fan the year before- -- 5 yrs before that a transformer. These haven't been major problems and I replace parts myself so it hasn't been that expensive.
3 years ago the guy who tuned up the furnace put his meter on it and said it was 85% efficient. [He retired and since then I've had idiots do the furnace & I've re-done it after they left. But I'm guessing it is still close. It sounds good & burns clean.]I only burn 420-500 gallons of oil a year. At current prices that's about $11-1300/yr. A high efficiency burner might save me 15% of that- so say $200 a year. That's a 15+yr payback for a new furnace-- so buying a new furnace now to save money isn't feasible.
I've considered buying a new gun or chassis, and see that they can be had for about $300. On the surface that seems like cheap insurance to just have one standing by. Unfortunately I don't see any that match what I have.
The furnace is a Borg-Warner- U-447102 [also a # P2UFD17F0801A on it] and the burner is a Ducane DMR-10A
It is rated for 85,000 BTU & I'd say from usage is about right-- on the rare days when it hits 20 below zero it heats the house, but doesn't shut down much.
Any thoughts?
thanks, Jim