According to my rough calculations if oil were $4 a gallon it would probably cost me close to $25 a day if my furnace only ran 4 hours which means that it will not be comfortable. If I run my furnace for only 1 hour per day to give me the domestic hot water I need and leave me will a full tank of heated DHW, the cost would be less than $6 a day. If I burn average 40# of coal at $310 per ton for 150 days which equates to 3 tons over 150 days that would cost another $6.2 per day for a total of about $12.5 per day x 150 days.
The LL comes with domestic hot water coil and you're going to want to use it if you switch to coal. You can hook it right into your existing electric hot water heater and just shut the hot water heater off. We do that and the water is always plenty hot. If you're not using enough hot water to maintain temperature then consider routing it around the hot water heater. Worse case if you don't route around is you have screaming hot water going into the electric hot water heater as a supply so it won't run that much anyway. We don't need the electric hoe water heater but keep the electric hot water heater around in case of failures and in your case when the warm weather hits when you shut off the boiler you can always turn on the electric hot water heater.
I would theoretically save $1875 in oil costs over 150 day period and the house would probably be more comfortable than running my 1.5 GPH oil burner for 4 hours per day
There's an easy way to figure this out using the calculator here. http://nepacrossroads.com/fuel-comparis ... ulator.php
First in the top part fill in your local costs per gallon and for the coal and adjust the efficiencies
In the second part from the drop down menu select oil. If you know how much you spent on oil last yea put in the amount you spent the hit recalculate. You can use any amount, e.g. if you know you spent $15K over 4 years you can use that too.
For example using these numbers:
Coal - $280/ton - 85% efficiency
Oil - $4/gal. - 85% efficiency
Oil - $4000 (assuming you used 1000 gallons of oil)
You would need to purchase $1,618.05 of coal.
. Furthermore if I ever sold the house and moved I could theoretically take the stoves with me or sell them.
One of the members here lived in NJ and took his efm boiler with him when he moved to NC. He's probably the only person in that state with a efm boiler.