Chris Lewis wrote:
Two pole is safer (the guts of the heaters are, theoretically at
least, dead
when the thermostat is off), but you'll find that particularly with
electronic controls, they usually cost MUCH more and are harder to
find.

Tho, that CT1950B seems to be a dual version, if your local has it in
stock and it doesn't cost much more, I'd recommend it.

Of course, unless wiring for the other half of the circuit is neatly
tucked away behind that wall (it might be, can't tell from the picture),
you'll have to rewire in order to use the 2 pole CT1950B.