Here is a simplified sketch on how to tie your Wood Boiler to your Oil Boiler. It should be self explanitory.
Your Buderus WB should be able to be equiped with An Aquastat to control your water temp. with in reason. It may either vary draft, or cycle a combustion fan.(didn't check). The sketch is presuming that you have multiple zone pumps, but if valves, you will have a single circulator pump between the oil boiler and Distribution Manifold. The aquastat controling the circulator on the WB can also be tweeked, depending upon the type of radiation you have. There are also some other issues with this system that need to be addressed if you have low temp radiant heat, like I have, but I won't get into that. You may also have to put in a bigger expansion tank ???
A safty note:: make sure your P&T valves are in working order, and also the pressure and backflow preventer is working.
Loren the Acg.