We would use approximately 800 gallons of fuel to heat our house. We would keep the house at 67 to 68 degress and used electrical space heaters to conserve oil. We would spend around $2,400 per season for oil.
With the Keystoker, I estimate that we will use around 5 tons of coal. I buy the coal bagged and it costs me $325 a ton. The house is a nice consistant 72 degrees all day long and we are not using the space heaters at all. As an added bonus we just got our electrical bill and there is a $100 reduction compared to last years bill at this time.
I estimate that I will save somewhere between $1,000 to $1,100 this year.
At that reate, my Keystoker including installation will be paid back in 4 years.
Using coal for me is actually easier than oil. I have to keep a path to the back of my house shoveled and the back gate shoveled so that the oil man can get to the input valve. The coal on the other had goes right into my attached fuel storage area which I keep cleared with a plow. Not using oil, don't need the path.