Absolutely love our outside wood boiler!
Back in '08? we spent over two grand on fuel oil to heat our single wide trailer with the high fuel prices at the time. When we bought our old farmhouse we have now there was no easy place for a woodstove so I bought a wood furnace from TSC and put it in the cellar. Bad thing with them is when it's in the 30s we had to have a window open cause it was too hot, single digits it didn't warm up the house....Didn't like it down there anyway, scared of fire.
Bought our OWB, best investment ever, no fear of fire, all mess outside, heats the house just like a oil furnace, we use forced hot air with it, some have base board heat, I like the forced hot air, radiator in the phlenum of the oil furnace, blower kicks on and off with a thermostat.
The big savings is in the wood for us, I can get ten full cord off stateland for $110, I've done it but a lot of work and hauling.
I've been just getting tri-axle loads of log length delivered by a local logging company for $700, more $ but easier and still a LOT cheaper than having cut/split delivered, they price that stuff like gold.