![Amazon.com : Hydor Theo Shatterproof Aquarium Heater, 25-Watt & Ideal For 2 To 7 Gallon Fish Tanks, 7-Inches Long : Pet Supplies Amazon.com : Hydor Theo Shatterproof Aquarium Heater, 25-Watt & Ideal For 2 To 7 Gallon Fish Tanks, 7-Inches Long : Pet Supplies](https://m.media-amazon.com/images/I/41MpurjBm8L._SR600%2C315_PIWhiteStrip%2CBottomLeft%2C0%2C35_PIStarRatingFOUR%2CBottomLeft%2C360%2C-6_SR600%2C315_ZA2%252C209%2C445%2C290%2C400%2C400%2CAmazonEmberBold%2C12%2C4%2C0%2C0%2C5_SCLZZZZZZZ_FMpng_BG255%2C255%2C255.jpg)
Amazon.com : Hydor Theo Shatterproof Aquarium Heater, 25-Watt & Ideal For 2 To 7 Gallon Fish Tanks, 7-Inches Long : Pet Supplies
![Amazon.com: Hydor ETH 300 In-Line External Aquarium Heater, 300w, 5/8" hose, Black : Everything Else Amazon.com: Hydor ETH 300 In-Line External Aquarium Heater, 300w, 5/8" hose, Black : Everything Else](https://m.media-amazon.com/images/I/812pkFj2f+L.jpg)
Amazon.com: Hydor ETH 300 In-Line External Aquarium Heater, 300w, 5/8" hose, Black : Everything Else
![Using a 50 Watt Submersible Aquarium Heater for Chicken Waterer Hydor (To Keep Water from Freezing) - YouTube Using a 50 Watt Submersible Aquarium Heater for Chicken Waterer Hydor (To Keep Water from Freezing) - YouTube](https://i.ytimg.com/vi/00wHG6OLDhQ/maxresdefault.jpg)
Using a 50 Watt Submersible Aquarium Heater for Chicken Waterer Hydor (To Keep Water from Freezing) - YouTube
![Hydor Theo Shatterproof Aquarium Heater, 50-Watt & Ideal For 5 To 14 Gallon Fish Tanks, 7-Inches Long : Pet Supplies - Amazon.com Hydor Theo Shatterproof Aquarium Heater, 50-Watt & Ideal For 5 To 14 Gallon Fish Tanks, 7-Inches Long : Pet Supplies - Amazon.com](https://m.media-amazon.com/images/I/41cSY-XqMKL._AC_UF1000,1000_QL80_.jpg)