Heating 1 - 5 is a thermostat Doodledog. Each number means the heat goes up to a fixed temperature. We used to have heating with a 1 - 5 thermostat in the hall, not now we have a thermostat with temperatures on. However all our radiator thermostats have 1 - 5 on them.
We live in an old timber framed farmhouse, with a range cooker and everyone expects us to have an AGA or equivalent. All our neighbours have them.
We don't, we are on mains gas and electricity and we have a perfectly normal dual fuel cooker, gas/elctricity and I wouldn't have an AGA if you paid me.
It seems to me that an awful lot of of us do not have the same things, suggesting they are not so unusual not to have. Why, therefore do we perceive them as being essentials?