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I thought most boilers self modulated based on water temp in the heating loop and whether a signal call was there. What additional value does an external modulation provide?
My Drayton wiser system was a piece of piss to install. It just dropped into the standard controller back plate. I left the hallway thermostat on full until I had the time to remove it.
Grumpy_Git
I think by throttle Jameo means modulate the burners / flow temp via modbus rather than just on/off. More nuanced and efficient control.