Can you fit a room thermostat to control a Rayburn. We have a Rayburn and a Mega flow system with stat valves on the radiators. With the outside temperature going up and down, we're often too hot or too cold and a room stat would be great.
I suppose you could fit a room thermostat that would divert surplus hot water round another circuit to lose the heat somewhere else, but I don't see how it could actually control the rate at which fuel like coal or logs was thrown into the furnace.