Its funny I always see only one method out of many of setting the old fashioned waterers. My new one for the winter will be on cinder blocks with a pie pan heater but also suspended from the rafter (taking about half the weight) heater is plugged into thermocube.
Up off the ground so it does not get as dirty, suspended so they can not knock it over when it gets down to a 1/4 full, plugged into thermocube so the bulb is not on all the time when the temp changes or I dont have to remember to turn it on and off manually.
A combination of techniques works better for me
I visit the chickens a minimum of twice a day, but automation is a great thing. Thermocubes for water heat, front and back motion lights to help scare predators, timer on inside light to cycle 1 hour before sunrise and 1 hour after sunset. I am getting 7-10 eggs a day from 11 hens that are of laying age.
Up off the ground so it does not get as dirty, suspended so they can not knock it over when it gets down to a 1/4 full, plugged into thermocube so the bulb is not on all the time when the temp changes or I dont have to remember to turn it on and off manually.
A combination of techniques works better for me

I visit the chickens a minimum of twice a day, but automation is a great thing. Thermocubes for water heat, front and back motion lights to help scare predators, timer on inside light to cycle 1 hour before sunrise and 1 hour after sunset. I am getting 7-10 eggs a day from 11 hens that are of laying age.