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Use of solid fuel burner to supplement oil boiler? - wood burning boilers blue print

Hi Folks,
I thought about that a solid fuel burner reduce my oil burner work on heating costs. I have to give a good supply of free wood at the time, others for the record. The oil-burner to work and all the plumbing and heating, etc. in the garage and easy access. I knew a man who did this and had a small kitchen in the kitchen, which used to burn coal. Unfortunately, there is nothing you can not ask! (the guy was a plumber, so I guess I thought it would be) a good idea, but I remember I had a radiator gravity feed into the system through the use of up. It would be nice to get a little heat "for free" and / or hot water.
Those who have been before? Any advice would be "hotly appreciated: o)
Salud!
Paul