HELP! on radiant add on to existing zone

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RADIANT ZONE

want to add dining room radiant heat off existing base board heat. all existing zones haver zone valves, how do i pipe mixing valve to existing zone. thanks in advance diagram would be helpfull

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here's one way

This uses an existing zone and adds the floor loop to it. However you do it involves putting a pump in after the mixing valve, to provide the force needed on both sides of the mixing valve inlet.