Aquarium Heater Guide: Sizing, Safety and Setup
By Melbourne Tropical Team ยท 1 min read
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How to choose, size and safely run an aquarium heater, plus why redundancy matters in larger tanks.
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Why heaters matter
Stable temperature is critical to tropical fish health. Fluctuations stress fish and trigger disease outbreaks like ich.
Sizing your heater
A rough guide is 1 watt per litre, or 1.5 watts per litre in cold rooms. Use our heater calculator to size yours precisely.
Safety and redundancy
In tanks over 200 litres, run two smaller heaters so a single failure won't cook or chill your fish. Always use a separate thermometer to verify the temperature, and unplug heaters during water changes.
Frequently Asked Questions
What wattage heater do I need?
Around 1 watt per litre for a small temperature rise, or 1.5 watts per litre in cooler rooms.
Should I use two heaters?
Yes in larger tanks โ two smaller heaters provide redundancy and more even heating.