Heaters & Chillers Temperature Control Guides
Sizing guides, installation tips, and product reviews for aquarium heaters and chillers. Keep your tank at the right temperature year-round.
Most tropical freshwater fish need water between 76-82°F, and even small temperature swings stress fish and weaken their immune systems. An adjustable heater is essential equipment for any tropical tank. Size your heater at roughly 5 watts per gallon — a 20-gallon tank needs a 100-watt heater.
Chillers solve the opposite problem. Summer heat, reef tank lighting, and warm climates can push water temperatures above safe levels. Aquarium chillers use refrigeration to bring water back into range — critical for coral reef tanks and cold-water species like axolotls.
Guides & Reviews
Everything you need to choose, install, and maintain aquarium temperature control equipment.
Best Aquarium Chillers: Keep the Perfect Water Temperature (2026)
The best aquarium chiller for most tanks is the BAOSHISHAN 1/10 HP — quiet, compact, and digitally controlled. Full reviews of top refrigeration chillers with buying guide.
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How to Choose and Use an Aquarium Heater: Types, Sizing, and Setup
Complete guide to aquarium heaters. Learn the main heater types, how to size a heater for your tank, proper installation steps, safety precautions, and top product picks for freshwater and saltwater tanks.
Read GuideRelated Equipment Guides
Temperature is one piece of the puzzle. These guides cover the rest.