There are base heaters that work with plastic waterers but they typically don't work in extreme cold because they can't get to hot or it would melt the plastic. I used mine cranked up to the highest setting during the last cold snap we had and it kept water from freezing when it was about 2 degrees F but the water was cold.
I guess extreme cold depends on where you live. Where I live, in northern Minnesota, we typically get a week or two of -35F to -40F temps. To me, thats very cold. But even at the -40F temps, my metal base heater has been keeping my metal fount waterer ice free inside the chicken coop. I cannot remember the turn on/cut off temps of the heater, but I think it is designed to keep the water at +35F. The heater base automatically shuts itself off if the temp is above that ~+35F range.
In the dead of winter, when the heater base is turned on and running 24/7, it costs me about $0.36 per day or $11.00 per month to heat the water. For me, that's a small price to pay to keep fresh water in the coop for the chickens and keep them alive.
Interestingly, the heater base is only rated to keep the water from freezing down to +10F, but inside the chicken coop, out of the wind and blowing snow, it still keeps my water from freezing even down to those days when we hit -40F.

When I looked into buying my heater/waterer setup, the plastic options were not rated for our lowest expected temps, so I went with the metal base heater and 3-gallon metal waterer fount option. It has worked great for me.
And, in keeping with the theme of this thread, I have never had a problem getting the metal waterer top off for refilling or cleaning, even when it gets down to -40F!
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