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I understood that combi Boilers are designed to work with a pressurized water supply. Am I wrong?

I have an existing gravity fed from wood stove hot water system, but no C/H. I have now installed 7 radiators and want to hook these up to a new GAS boiler. I would like to combine the H/W supplies so that when the fire is lit it will switch the supply over to the wood stove. Possibly through a...