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Outdoor wood boiler with LP combi boiler as back up
Home owner wants to install a outdoor wood boiler (open system) with a LP gas combi boiler as back up heat.
Anyone have a piping drawing of how this should be installed.
Hot rod does caleffi address this in any of their Idronics books?
I thought of coming in from the outdoor wood boiler with a SS or bronze pump into a plate heat exchanger and then into a 80 gallon buffer tank (buffer tank will have a coil for preheating the domestic water during the heating season) and then out of the buffer tank to the heating zones. The condensing LP gas combi boiler will also be piped into the same buffer tank and it would run only when the tank temp goes below a certain temp to heat the house if they run out of wood.
The buffer tank would also work as P/S piping for the combi boiler.
Anyone had piping drawings of an installation like this?