Fountain Pond Heater Options?

[Noodlebrain]

I have a 78 gallon fountain pond. 5.5' in diameter and 30" deep. The pond is half (15") in the ground and half (15") above ground. We live in south MIssissippi and I intend to have some tropical fish there. I approaches 28 degrees in the winter and I want to keep the temp no colder than 55 degrees. Is there a heater with thermostat that I could drop in when needed?

Thanks in advance for your help.

 

[j.w]

@Noodlebrain
Might be but I dunno as I never use any here. I just did a quick look and it appears they do: https://www.amazon.com/pond-heater-thermostat/s?k=pond+heater+with+thermostat Your pond is small tho so don't know if any will work for your situation.