Best 300 Watt Aquarium Heaters

Orlushy Submersible Aquarium Heater,300W Adjustable Fish Tahk Heater with 2 Suction Cups Free Thermometer Suitable for Marine Saltwater and Freshwater

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

HiTauing Aquarium Heater, 300W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 8.2Ft Cord for 40-75 Gallon Fish Tank.

hygger Aquarium Heater 300W/500W/800W/1000W, Submersible Fish Tank Heater with Digital LED Controller and Intelligent Leaving Water Automatically Stop Heating System, for Freshwater and Saltwater

HITOP 50W 100W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cup (300W)

hygger Aquarium Heater 300W 500W 800W 1000W 1200W, Large Adjustable Fish Tank Heater with Intelligent Automatic Power-Off System, Water Heater with LED Digital Display, for Saltwater and Freshwater

YukiHalu Aquarium Heater 50/100/200/300/500W with Protective Case, Fish Tank Heater, Temperature Adjustable, External Temperature Controller, LED Display, Used for 10/20/40/75/120 Gallons (300W)

Fluval E 300 Watt Electronic Heater

HITOP Mini Submersible Aquarium Heater - 300W Digital Heater for Fish Tank Turtle Tank 45-70 Gallon, Saltwater and Fresh Water with Temperature Controller (300W)

Marineland Precision Heater for Saltwater or Freshwater Aquariums