From June of '07 until now, I have had delivered 1146 gallons of oil. Today's cost is 4.70/gallon. If I estimate $5/gallon, I can expect a $5800 bill for the next year's oil. That's assuming it is only $5/gallon - conservative...
If I use Coal, 1146/180=6.4 tons. I'm still trying to get prices for coal, but I'm expecting $250/ton? I realize that may be inaccurate, but I'm trying to estimate based on predictions and what I'm hearing. Even so, that's a $1600 bill for a year.
With a savings of $4200/year, I expect to have paid for a coal boiler in one to two years! Even if I change the numbers to raise the price of coal and raise the installation costs, it's still only a two year payback on the investment. I think I have the wife convinced! And I'm really looking forward it!