The boiler, unless a cold start, will always come on to maintain the water in it at a standby temperature set through the aquastat. It circulates it based on a heat call from the thermostat that you have on your wall.
If the thermostat is too close to the wood stove, it will perceive that the entire heat loop that is attached to is at whatever temperature it is reading.
So a really cold room could dip below freezing as long as the thermostat equated with it does not sense the room to be colder than its setting.
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