hygger 25W Small Aquarium Heater, Betta Fish Tank Heater with Adjustable Temperature External Controller and Over-Temperature Protection, for 5-10 Gallons Freshwater & Saltwater Fish Tank Turtle Tank

It’s comparatively really rare. Knock on wood, but I’ve never had a heater fry a tank in all my years keeping fish. It is worth getting one from a reputable brand though.I like the ones for smaller tanks that hygger makes.