Best 1 Gallon Fish Tank Heater

Interpet Deltatherm Aquarium Fish Tank Heater, adjustable, for Tropical and Marine, 300 W, for aquariums up to 270 litres, Black

HITOP HP-608 Submersible Aquarium Heater 25W 50W With Thermometer and Extra Sucker Cup (50W)

PYPABL 25W 50W 100W 300WAquarium Heater, Submersible Glass Heater for 5L-300Litres Fish and Turtle Tank (300W for 140-300L)

hygger Small Submersible Aquarium Heater,Mini Betta Turtle Tank Heater with Digital Display Controller,75W Fish Tank Heater Suitable for 38-57L Freshwater Tanks

HITOP HP-608 Submersible Aquarium Heater 100W 200W 300W With Thermometer and Extra Sucker Cup (100W)

ONLYSTAR Submersible Aquarium Heater ， Digital LED Display ，for Tropical Fish/Freshwater Fish/Betta Fish/Turtle，Shatterproof Heater， Fish Tank Thermostat- UK PLUG With Extra Sucker Cup (150W)

ONLYSTAR Fish Tank Heater 50W/100W/200W/300W/500W with Over-Temperature Protection, Explosion Proof Quartz Glass, Aquarium Heater with LED Thermostat Controller (200W)

GlowUp 50W Mini Fish Tank Heater, Submersible Aquarium Heater with Suction Cup and LED Digital Display Thermostat, Tropical Fish Turtle Tank Heater for Betta Fish, Saltwater and Freshwater up to 60L

U-picks USB Powered Aquarium Heater, 10W Adjustable Mini Fish Tank Heater with External Temperature Controller, LED Display, Used for 2-4 Litres Tank (10W USB)

TobeBright Aquarium Heater,100W Fish Tank Heater for Tropical,Submersible Turtle Tank Heater with Over-Temperature Protection for 50-70L Betta Fish Tank,Saltwater and Freshwater