Aquarium Heaters
Stable temperature keeps tropical fish healthy and colorful. Browse our heaters, then tell us your tank size and room temperature and we will help you size one.
Heaters in stock
Live inventory from our store. Selection changes as shipments arrive.
How to choose an aquarium heater
Match wattage to tank size
Larger tanks and cooler rooms need more wattage. Heater packaging lists the tank sizes it is meant for, and we can help you choose.
Use a separate thermometer
Do not trust a heater's setting alone. A thermometer in the tank tells you the real temperature.
Know your fish
Most tropical fish want warm, stable water, while goldfish and some other species prefer cooler water and do not need a heater.
Related: Betta care in a small tank, Setting up a freshwater aquarium.
Common questions
Do all aquariums need heaters?
No. Tropical fish usually need one in most homes. Goldfish and some other species do not. Tell us what you keep.
Can I use two heaters in a large tank?
Many keepers use two smaller heaters at opposite ends of a large tank for more even heating and a backup if one fails.
Not sure what fits your tank?
Bring your tank size and what you keep in it, and we will help you choose.