Here is how I tied my wood/coal boiler into my existing oil burner and still able to use all the existing controls that were part of the oil set-up. I was having trouble with the cold water in the pipes, from the wood fire going out, causing my oil burner to start up until both boilers were equalized, so I disabled the oil burner and control it with a switch at the top of the steps. It's a good idea to run it once a month for a few minutes.
Supply hot water from my wood/coal boiler arrives at the oil boiler traveling in the direction shown at point 6. It travels horizontally to the right, behind the pipe shown at point 4, and then down to the bottom of the right side of the oil boiler and enters the boiler. A circulator at the wood/coal boiler is moving the water.
At the top of the picture, at point 1, return water from my heating zones is returning to the bottom left of the oil boiler using a circulating pump mounted at the left base of the boiler.
Some of the return water from the heating loops is forced back into the supply line to my heating loops, using a hand valve. It's called a bypass loop and is shown at point 2.
You can't see it in the picture, but right behind the emergency shutoff switch and to the right of point 4 is the tee where the water exits the oil boiler and either goes back to the wood/coal boiler via the pipe at point 3 for reheating or to the zone valves via the pipe at point 5.
There are two check valves in this piping.
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