![Amazon.com: INKBIRDPLUS 300W Submersible Aquarium Heater Titanium Fish Tank Auto Thermostat with LED Digital Temperature Readout and External Temperature Controller for Salt Water and Fresh Water : Pet Supplies Amazon.com: INKBIRDPLUS 300W Submersible Aquarium Heater Titanium Fish Tank Auto Thermostat with LED Digital Temperature Readout and External Temperature Controller for Salt Water and Fresh Water : Pet Supplies](https://m.media-amazon.com/images/I/71Mak2-CWiL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: INKBIRDPLUS 300W Submersible Aquarium Heater Titanium Fish Tank Auto Thermostat with LED Digital Temperature Readout and External Temperature Controller for Salt Water and Fresh Water : Pet Supplies
![Amazon.com : Orlushy 50W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 5-10 Gallons Freshwater & Saltwater Tanks : Pet Supplies Amazon.com : Orlushy 50W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 5-10 Gallons Freshwater & Saltwater Tanks : Pet Supplies](https://m.media-amazon.com/images/I/61YFhYN6pcL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : Orlushy 50W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 5-10 Gallons Freshwater & Saltwater Tanks : Pet Supplies
![Amazon.com: DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker : Pet Supplies Amazon.com: DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker : Pet Supplies](https://m.media-amazon.com/images/I/61u1WDt2FpL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker : Pet Supplies
![Amazon.com : BKTC Submersible Aquarium Heater 50W Fish Tank Heater 50 Watt Adjustable Temperature for 5 to 15 Gallon Tank, 2 Count (Pack of 1) : Pet Supplies Amazon.com : BKTC Submersible Aquarium Heater 50W Fish Tank Heater 50 Watt Adjustable Temperature for 5 to 15 Gallon Tank, 2 Count (Pack of 1) : Pet Supplies](https://m.media-amazon.com/images/I/61whCkEpHuL._AC_UF1000,1000_QL80_.jpg)
Amazon.com : BKTC Submersible Aquarium Heater 50W Fish Tank Heater 50 Watt Adjustable Temperature for 5 to 15 Gallon Tank, 2 Count (Pack of 1) : Pet Supplies
![Amazon.com: AquaClear Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies Amazon.com: AquaClear Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies](https://m.media-amazon.com/images/I/61jO9JRRZQS._AC_UF1000,1000_QL80_.jpg)
Amazon.com: AquaClear Marina Betta Fish 8W Submersible Heater - For Fish Tank Aquariums up to 1.5 US Gallons (5 L) : Pet Supplies
![Amazon.com: SZELAM Aquarium Heaters 100W Submersible Fish Tank Heater, Anti-Dry Burning and Anti-Overheating, Explosion-Proof Fast Heating Fish Heater for Freshwater and Saltwater Aquarium Tank Heater : Pet Supplies Amazon.com: SZELAM Aquarium Heaters 100W Submersible Fish Tank Heater, Anti-Dry Burning and Anti-Overheating, Explosion-Proof Fast Heating Fish Heater for Freshwater and Saltwater Aquarium Tank Heater : Pet Supplies](https://m.media-amazon.com/images/I/71gz4sF8WwL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: SZELAM Aquarium Heaters 100W Submersible Fish Tank Heater, Anti-Dry Burning and Anti-Overheating, Explosion-Proof Fast Heating Fish Heater for Freshwater and Saltwater Aquarium Tank Heater : Pet Supplies
![Amazon.com: hygger 100W Mini Submersible Digital Display Aquarium Heater for Small Fish Tank, Compact and Fast Heating Thermostat, with External Controller and Built-in Thermometer, for Betta, Turtle : Pet Supplies Amazon.com: hygger 100W Mini Submersible Digital Display Aquarium Heater for Small Fish Tank, Compact and Fast Heating Thermostat, with External Controller and Built-in Thermometer, for Betta, Turtle : Pet Supplies](https://m.media-amazon.com/images/I/61lLd5bp2AL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: hygger 100W Mini Submersible Digital Display Aquarium Heater for Small Fish Tank, Compact and Fast Heating Thermostat, with External Controller and Built-in Thermometer, for Betta, Turtle : Pet Supplies
![Amazon.com: AQQA Aquarium Heater 800W for 80-220 Gallon Submersible Fish Tank Heater for Aquarium Betta Fish Heater Aquarium Thermostat Heater Hydroponic Freshwater & Saltwater (800W, 80-220Gal) : Pet Supplies Amazon.com: AQQA Aquarium Heater 800W for 80-220 Gallon Submersible Fish Tank Heater for Aquarium Betta Fish Heater Aquarium Thermostat Heater Hydroponic Freshwater & Saltwater (800W, 80-220Gal) : Pet Supplies](https://m.media-amazon.com/images/I/71sUqQUxfZL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: AQQA Aquarium Heater 800W for 80-220 Gallon Submersible Fish Tank Heater for Aquarium Betta Fish Heater Aquarium Thermostat Heater Hydroponic Freshwater & Saltwater (800W, 80-220Gal) : Pet Supplies
![Amazon.com: AquaMiracle Adjustable 50W Aquarium Heater Submersible Fish Tank Heater Super Short Aquarium Heater with LED Digital Display Thermostat, for Tanks 5-10 Gallons : Pet Supplies Amazon.com: AquaMiracle Adjustable 50W Aquarium Heater Submersible Fish Tank Heater Super Short Aquarium Heater with LED Digital Display Thermostat, for Tanks 5-10 Gallons : Pet Supplies](https://m.media-amazon.com/images/I/61wAAPYibJL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: AquaMiracle Adjustable 50W Aquarium Heater Submersible Fish Tank Heater Super Short Aquarium Heater with LED Digital Display Thermostat, for Tanks 5-10 Gallons : Pet Supplies
![Amazon.com: FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer : Pet Supplies Amazon.com: FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer : Pet Supplies](https://m.media-amazon.com/images/I/71UpSTTTLKL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer : Pet Supplies
![Amazon.com: HiTauing Aquarium Heater, 500W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 8.2Ft Cord for 75-120 Gallon Fish Tank. : Pet Supplies Amazon.com: HiTauing Aquarium Heater, 500W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 8.2Ft Cord for 75-120 Gallon Fish Tank. : Pet Supplies](https://m.media-amazon.com/images/I/71CKPlQPQ1L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: HiTauing Aquarium Heater, 500W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 8.2Ft Cord for 75-120 Gallon Fish Tank. : Pet Supplies
![Amazon.com: 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 : Pet Supplies Amazon.com: 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 : Pet Supplies](https://m.media-amazon.com/images/I/612C0o8XoKL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: 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 : Pet Supplies
![Amazon.com: Kulife Fumak Adjustable 20W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater Turtle Heater Super Mini Aquarium Heater with Digital Display Thermostat, for 2-4 Gallon Tanks : Pet Supplies Amazon.com: Kulife Fumak Adjustable 20W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater Turtle Heater Super Mini Aquarium Heater with Digital Display Thermostat, for 2-4 Gallon Tanks : Pet Supplies](https://m.media-amazon.com/images/I/71-v9Of9NJL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Kulife Fumak Adjustable 20W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater Turtle Heater Super Mini Aquarium Heater with Digital Display Thermostat, for 2-4 Gallon Tanks : Pet Supplies
![Amazon.com: YukiHalu Small Submersible Aquarium Heater, Adjustable Mini Fish Tank Heater 25W 50W 100W 200W 300W with External Temperature Controller, LED Display, Used for 5/10/20/40/60 Gallons (100 Watts) : Pet Supplies Amazon.com: YukiHalu Small Submersible Aquarium Heater, Adjustable Mini Fish Tank Heater 25W 50W 100W 200W 300W with External Temperature Controller, LED Display, Used for 5/10/20/40/60 Gallons (100 Watts) : Pet Supplies](https://m.media-amazon.com/images/I/61mWSwJO-dL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: YukiHalu Small Submersible Aquarium Heater, Adjustable Mini Fish Tank Heater 25W 50W 100W 200W 300W with External Temperature Controller, LED Display, Used for 5/10/20/40/60 Gallons (100 Watts) : Pet Supplies
![Amazon.com: FEDOUR Adjustable Aquarium Heater with Protective Cover, 30W 50W 60W 120W Submersible Heater Thermostat for 5-40Gallon Fish and Turtle Tank (50W for 5-15Gallon) : Pet Supplies Amazon.com: FEDOUR Adjustable Aquarium Heater with Protective Cover, 30W 50W 60W 120W Submersible Heater Thermostat for 5-40Gallon Fish and Turtle Tank (50W for 5-15Gallon) : Pet Supplies](https://m.media-amazon.com/images/I/61Jqhn4rTsS.jpg)
Amazon.com: FEDOUR Adjustable Aquarium Heater with Protective Cover, 30W 50W 60W 120W Submersible Heater Thermostat for 5-40Gallon Fish and Turtle Tank (50W for 5-15Gallon) : Pet Supplies
![Amazon.com: SunGrow Halfmoon Betta Heater, 10 Watts, for Small Tanks, Fully Submersible Aquarium Heater, Automatically Reaches Preset Temperature, Energy-Efficient Heating Module, Suction Cups Included : Pet Supplies Amazon.com: SunGrow Halfmoon Betta Heater, 10 Watts, for Small Tanks, Fully Submersible Aquarium Heater, Automatically Reaches Preset Temperature, Energy-Efficient Heating Module, Suction Cups Included : Pet Supplies](https://m.media-amazon.com/images/I/71jzQ5JCIjL.jpg)
Amazon.com: SunGrow Halfmoon Betta Heater, 10 Watts, for Small Tanks, Fully Submersible Aquarium Heater, Automatically Reaches Preset Temperature, Energy-Efficient Heating Module, Suction Cups Included : Pet Supplies
![Amazon.com: auomii USB Aquarium Heater,10/20/30W Adjustable Mini Fish Tank Heater, External Temperature Controller, LED Display, Used for 1-3 Gallon Tank : Pet Supplies Amazon.com: auomii USB Aquarium Heater,10/20/30W Adjustable Mini Fish Tank Heater, External Temperature Controller, LED Display, Used for 1-3 Gallon Tank : Pet Supplies](https://m.media-amazon.com/images/I/71zD5iSVM5L._AC_UF1000,1000_QL80_.jpg)
Amazon.com: auomii USB Aquarium Heater,10/20/30W Adjustable Mini Fish Tank Heater, External Temperature Controller, LED Display, Used for 1-3 Gallon Tank : Pet Supplies
![Amazon.com: Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon : Pet Supplies Amazon.com: Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon : Pet Supplies](https://m.media-amazon.com/images/I/81TdZIzoTML._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt, 2-10 Gallon : Pet Supplies
![Amazon.com: HITOP Mini Submersible Aquarium Heater - 50W Digital Heater for Fish Tank Turtle Tank 5-15 Gallon, Saltwater and Fresh Water with Temperature Controller (50W) : Pet Supplies Amazon.com: HITOP Mini Submersible Aquarium Heater - 50W Digital Heater for Fish Tank Turtle Tank 5-15 Gallon, Saltwater and Fresh Water with Temperature Controller (50W) : Pet Supplies](https://m.media-amazon.com/images/I/71RKVA401fL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: HITOP Mini Submersible Aquarium Heater - 50W Digital Heater for Fish Tank Turtle Tank 5-15 Gallon, Saltwater and Fresh Water with Temperature Controller (50W) : Pet Supplies
![Amazon.com: Aquarium Heater 25W Small Fish Tank Heater Submersible 25W 50W 100W, Precise Temperature Control with Intelligent Memory Function, External LED Digital Temp Controller Suitable for Betta Fish Turtle : Pet Supplies Amazon.com: Aquarium Heater 25W Small Fish Tank Heater Submersible 25W 50W 100W, Precise Temperature Control with Intelligent Memory Function, External LED Digital Temp Controller Suitable for Betta Fish Turtle : Pet Supplies](https://m.media-amazon.com/images/I/71ykEa-t2uL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Aquarium Heater 25W Small Fish Tank Heater Submersible 25W 50W 100W, Precise Temperature Control with Intelligent Memory Function, External LED Digital Temp Controller Suitable for Betta Fish Turtle : Pet Supplies
![Amazon.com: FREESEA Aquarium Fish Tank Heater: 100 Watt Submersible Betta Heater - Adjustable Thermostat with Thermometer for 15-25 Gallon Marine | Saltwater | Freshwater : Pet Supplies Amazon.com: FREESEA Aquarium Fish Tank Heater: 100 Watt Submersible Betta Heater - Adjustable Thermostat with Thermometer for 15-25 Gallon Marine | Saltwater | Freshwater : Pet Supplies](https://m.media-amazon.com/images/I/61qXFexDrVL.jpg)
Amazon.com: FREESEA Aquarium Fish Tank Heater: 100 Watt Submersible Betta Heater - Adjustable Thermostat with Thermometer for 15-25 Gallon Marine | Saltwater | Freshwater : Pet Supplies
![Amazon.com: FREESEA Aquarium Fish Tank Heater: 25 Watt Mini Submersible Heater Adjustable Thermostat for 1-5 Gallon Betta | Turtle : Pet Supplies Amazon.com: FREESEA Aquarium Fish Tank Heater: 25 Watt Mini Submersible Heater Adjustable Thermostat for 1-5 Gallon Betta | Turtle : Pet Supplies](https://m.media-amazon.com/images/I/71RcGUyWHQL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: FREESEA Aquarium Fish Tank Heater: 25 Watt Mini Submersible Heater Adjustable Thermostat for 1-5 Gallon Betta | Turtle : Pet Supplies
![Amazon.com: PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) : Pet Supplies Amazon.com: PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) : Pet Supplies](https://m.media-amazon.com/images/I/61PrJ9gAPSS._AC_UF1000,1000_QL80_.jpg)
Amazon.com: PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks (Preset Temperature 78℉) : Pet Supplies
![Amazon.com: HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cups (100W-grey) : Pet Supplies Amazon.com: HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cups (100W-grey) : Pet Supplies](https://m.media-amazon.com/images/I/615D4JHwbNS._AC_UF1000,1000_QL80_.jpg)