25W heater in 10 liter aquarium? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 03-09-2020, 02:41 PM Thread Starter
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25W heater in 10 liter aquarium?

I just got my new heater that I bought on ebay and is 25W. In the destripction it said that it can be used in 10 liter aquarium. So now I'm just curious if is safe to use it in 10 liter aquarium?
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post #2 of 3 (permalink) Old 03-09-2020, 03:54 PM
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It's certainly strong enough (unless this tank is in a very cold room). A common guideline for minimum heater size is 25 watts of heater power for every 10 gallons (roughly 37.8 liters) of water you want to warm by up to 10 fahrenheit (roughly 5.55 celsius). If you have a larger tank or need a larger temperature increase, multiply accordingly (eg if you need to increase the temperature of a 20 gallon tank by about 11 celsius, you need a 100+ watt heater). Heaters larger than this minimum will heat the tank faster, spend less time on, and thus be less prone to malfunctioning and cooking your tank.
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post #3 of 3 (permalink) Old 03-10-2020, 05:31 PM
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I use a 25 watt heater in a 5.5 gal (21 L) so you should be fine.

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