Best Betta Heaters

HiTauing Aquarium Heater, 50W/100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic Power-Off When Leaving Water for Saltwater and Freshwater

Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt

NICREW Aquarium Heater 50W, Temperature Adjustable Fish Tank Heater with Controller for 5-10 Gallon, Overheat Protection

NICREW Submersible Aquarium Mini Heater, Small Betta Fish Tank Heater with Electronic Thermostat, 15W

DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker, 1 Yr Warranty

AquaMiracle Adjustable 25W Mini Aquarium Heater Submersible Fish Tank Heater Turtle Tank Heater Small Aquarium Heater, with LED Digital Display, for Tanks 2-5 Gallons

Pawfly Submersible Aquarium Heater 25 W Betta Fish Tank Heater Adjustable Electronic Heating Rod with Thermostat Overheating Protection and Protective Cover for Fish Tanks up to 10 Gallons

Adjustable Mini Aquarium Heater 0.5-40 Gallon Submersible Small Fish Tank Heater Digital Display Thermostat External Temperature Controller 10W/20W/30W/25W/50W/100W/200W

Fish Tank Aquarium Heater - Adjustable Temperature Submersible Thermostat Heater,25W/50W/100W/150W/200W/300W

YukiHalu USB Powered Submersible Aquarium Heater, 10W/5V/2A Adapter, Mini Fish Tank Heater 10W with Built-in Thermometer, External Temperature Controller, LED Display, Used for 0.5-1 Gallon Tank