Most experienced saltwater aquarists know that using an inexpensive, poorly constructed tank heater can quickly lead to a disaster by either allowing the tank to chill, or worse yet over heat. Not only will a heater that fails to turn off "cook" your tank critters, it can also cause an electrical fire in your home. Poorly constructed heaters can also create a stray voltage leak in your tank. Knowing what features to look for in a heater can protect you and your wet pet friends.
About Submersible Heaters
Most saltwater aquarists have found that the submersible type heaters work best in their aquariums because they require little attention, particularly if the aquarium water level becomes rather low. Read our top pick aquarium heater reviews and compare prices on units that are considered to be of excellent quality and have been highly rated by users.
About Hang-On-Tank Heaters
Many saltwater aquarists prefer the hang-on-tank type heaters. While some of these models are complete with a built in hanger, others require a separate hanger. Most hang-on-tank aquarium heaters require constant submersion in water. If the water level drops too low in the aquarium, the heater becomes exposed and can then over heat and burn out. The good news, here are some models that have low water level protection or indicators, or that automatically shut off when over heating occurs.
About Cable Heaters
Installed underneath the substrate and manipulated by an additionally needed electronic controlling unit, cable heaters are common in freshwater planted aquariums to eliminate reduction areas (dead spots) by convection, but are seldom used in saltwater tanks. Pros - can't be seen; allows the substrate to retain and generate an even distribution of heat. Cons - difficult to replace because the substrate has to be removed to get to it; might be OK for fish-only but not recommended in reef tanks.
Other Heaters & Accessories
Compare prices on more submersible and hang-on-tank aquarium heaters, as well as suction cups, guards, holders, and many other heater accessories and replacement parts.
