Part of that comes down to the efficiency if your boiler. In my last house I was burning 2200-2500 gallons of oil a year (when oil was $3.50). My boiler was probably 75% efficient. I went to LP, used 2000 gallons with a new 96% efficient system and saved not only in the cost difference in the fuel, but burned less even though the btu comparison shows LP to be 25% less per gallon used. I still think the best deal going is LP, it is historically low and is less prone to market swings. How many gallons of oil per year do you use?
A lot of my employees use pellets and swear by them. I would not save them, I don't think they endure long term storage that well.
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