Buderus Indirect Water Heater - Water Coil Hookup

Anyone out there plumb a hot water coil from their coal/wood stove to a Buderus Indirect Water Heater for thermo-siphon or with a circulator pump system as a secondary system to an oil fired boiler? I reviewed the plumbing diagram for the Buderus tank and think it is a prime candidate for what I want to do but would like some first hand experience. I would most likely add a dump zone with a kick heater or baseboard fin tubes for an overheat condition...

http://s3.pexsupply.com/manuals/1289411698913/414 ... D_FILE.pdf