If you want to keep using your wood boiler to heat shop and house here is one way to do it tied to your gas boiler.If you want to go to a warmer climate in January, no problem. Just don't let your wood boiler or any piping freeze. The electrical is not shown in the drawings. I would say the boilers keep the manifold supplied with hot water. As the load removes the heat from the water the boiler or boilers will re-supply the manifold with their high and low limit controls.
I have a drawing showing zone valves used with this manifold system. To use zone valves you would need another manifold to mount the zone valves on and a pump to pull the water back into the return side of the manifold.
Another control would be needed on the Hot side of the manifold to power up the control to turn on the zone valve pump and open zone valves as the thermostat requires.
The one picture came from a Califfe, Idronics, journal of design innovation for hydronic professionals, #10
The drawing is how I want to re-plumb my system. The hydraulic separator and manifold piping are sized by Gallons per minute of the pump or pumps.
That second picture was put on by mistake. I do not know how to remove it.
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