Thanks, i did that. About 4-6 grand on ebay. Plus a few hundred for a plumber to hook it up. My oil cost is about $3k a year (when prices are high) $2k when low. Plus i figure wood cost would be 4 to 5 cords, = $700-1000 on avg. around here. So i save a grand or 2 a year.
So would take a 3 years to break even. Not too happy about that. Plus forking over $6 grand up front in this economy is probably a non starter.
As to your wood consummation. It would be the same... for my dad likes it scorching hot, so the vent is all the way open and burns way hot. But since there's no regulator, the fire would have to be checked every couple hours to keep the temp high enough.
I m shooting in the dark here.
Actually my friends dad is doing it himself, that's how i got onto this.. Coils, and some pack he said.. dunno, all greek to me. I'm sure his cost will be less than $500. But i dont feel right paying him to do mine.
This is how I visualize it....
Insert woodstove fire place heats up the coil pack with water leading to and from the main water system / tank. New (or existing) circulator moves water through the pipes. When it hits 170 degrees, i turn on the oil burner. Since the temp is above the burner kick on temp of 160, it shouldnt turn on. On the sub 30 degree days, im sure the wood stove wouldnt be able to keep the temp over 160 and thus the oil burner would kick in to help out.
I know its much more complicated than that.