I have a 4 yr. old Burnham boiler and steam heat. my boiler must be filled 2-3 times/wk in winter. are automatic water feeds good- i’ve been told they are not. there are no leaks and radiators are fine and not losing water. cold new england winter heat at 68
I have a McDonnell 47-2 automatic boiler feed with a low water cutoff. I just replaced it with a new one as the old one had rust build up in the float (which I found later I could have cleaned out manually).