I am replacing an old 2-pole dial thermostat for 2 baseboard heaters with a new digital model (Honeywell RLV4305A). I was surprised that though it says it is rated for 220, it is only single pole and thus breaks only one leg. According to the instructions, I should just connect the two white wires together. There is 110V between the line and load wires (expected) so when these are connected the circuit is raised 110V, which I don't love, but ok.
So having done that, to double-check things, I put my meter probe on the baseboard heater chassis itself and measured to the ground in a nearby receptacle. Got 110V!
So I am asking for confirmation in my thinking that a) this heater case has always been energized when it was on and we are lucky no one was hurt b) the heater(s) need to be replaced or re-wired by a pro