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https://www.amazon.com/Orlushy-Submersible-Heater-Fish-Thermostat-freshwater/dp/B07H2L8DZR/ref=mp_s_a_1_4?crid=RZOYSGB59Q49&keywords=aquarium+heater&qid=1705251344&sprefix=aquarium+heater%2Caps%2C213&sr=8-4 This is the one I have, the heater has to be strong enough to keep the nipples unfrozen...

Amazon sells $15 aquarium heaters that come with a electronic water temp thing. Always have a backup one as well In case one melts or malfunctions. Never let the water run out and expose the heater.

I use the same setup, I have a 150w aquarium heater at the bottom running it at 70f it keeps everything from freezing. I also use a 250w de icer in a bigger water trough.