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Hi namsag and thanks for "pointer up" advice. I see from my Honeywell manual that the boiler has an internal frost protector which circulates hot water when the critical temperature occurs. So I am wondering whether the Honeywell stat I described is really necessary, especially if the...

Hi, I have afrost stat in the garage near to my Glow Worm Compact boiler. It is a Honeywell Frost stat, a plastic rectangle with removable front panel. What you see inside is a circular dial marked 0 to 20 with a blue arrow at 3.(presumably a good temp for the boiler to switch on) The dial...