So, I have two used coal boilers sitting in my basement, but I'm not sure if I should install them. I purchased a new house last spring. It's a large home with a hydronic 6 zone system. When I purchased the home, I did not realize that the 5 outdoor condensing units were heat pumps. I thought they were AC units as they were labeled in the breaker boxes. Because I thought they were AC only, I left them turned off over the winter. I didn't realize that they were heat pumps until last week, when we turned the heat on for the first time this year. Instead, I ran the oil boiler from Jan until April and burned approximately 1500 gallons during that time.
In an effort to move away from oil, I purchased two used coal boilers this fall. The first was a Tarm 202 (80K BTU). I knew it was small for my house, but I purchased it because boilers of any kind appeared to be in short supply. I purchased it with the intent of selling it if I could find a larger unit before the winter. Then, last week, I found a Tarm 303 (120K BTU) which I purchased. The night I got the 303 home was the night that I discovered the heat pumps. So, now I'm trying to decided if I should install a coal boiler at all, and if so, how it should be installed. My electricity runs about 14c/KWh. It seems that I could install the coal in series with the oil, but only fire it up when the outdoor temp is below 35 degrees. That means that I would have to turn off the heat pump and then fire the coal boiler every time I want to make that transition. with falling oil prices, this would significantly extend my payback period.
Anyways, that's my long winded story, but I'm looking for suggestions on what I should do.