Immersible Aquarium Heaters
Immersible aquarium heaters (also called hang-on heaters as they clip to the side or back of your aquarium) are the least expensive type because they are not fully submersible. Penn Plax's Therma-Flow heaters are easy to set, have been around forever and are well-known for reliability and accuracy. Immersible heaters make great backup heaters in case of emergency - it's a cheap investment for the safety of your fishes.
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