Paste 500 Watt Submersible Aquarium Heater Auto Thermostat Fish Tank Heater 40-90 Gallon with Protective Sleeve and 3 Suckers : Amazon.ca: Pet Supplies
Amazon.com: VIVOSUN Submersible Aquarium Heater with Thermometer Combination, 50W Titanium Fish Tank Heaters with Intelligent LED Temperature Display and External Temperature Controller : Pet Supplies
Heaters
Commercial Immersion Heater
14.8. Aquarium Heaters
Fish Tank Heaters in Fish Tank Lighting and Heating - Walmart.com