E300 Electronic Heater, 300W, up to 100 US Gal / 375 L - Fluval USA
HITOP 300W PTC Submersible Adjustable Aquarium Heater, for Fish Tank/Turtle Tank up to 80 Gallon (300W) : Amazon.ca: Pet Supplies
Orlushy Submersible Aquarium Heater 300W-Fish Tahk Heater with Adjust Knob Thermostat 2 Suction Cups Suitable for Marine Reef Fish Tank Sump : Amazon.ca: Pet Supplies
Hagen Hagen Marina Submersible Heater for Aquarium, 300W : Amazon.ca: Pet Supplies
Fluval M300 Submersible Heater, 300 W, up to 80 US Gal (300 L) — Reef Supplies Canada
Aqua Heat Titanium Reservoir and Aquarium Heater 300W - Indoor Farmer
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. : Amazon.ca: Pet Supplies
Orlushy Submersible Aquarium Heater 300W-Fish Tahk Heater with Adjust Knob Thermostat 2 Suction Cups Suitable for Marine Reef Fish Tank Sump : Amazon.ca: Pet Supplies
300 Watt/500 Watt Aquarium Heater - hygger
Juwel Heating AquaHeat 300 - 300 watt Automatic-Heater (85815) - Rio 300/350 LED (2017 - Current) - Rio - Juwel Tanks - Parts by Tank
Aquarium Water Heater 50-300W Anti-Explosion for Tropical Fish Tank US | eBay
Hagen Hagen Marina Submersible Heater for Aquarium, 300W : Amazon.ca: Pet Supplies