Do Guppies Need a Heater?

Do Guppies Need a Heater?


There should be a heater in the tank with the guppies.



Your guppy is vulnerable to a host of potentially fatal issues if exposed to extreme temperature swings.

The water temperature should not only be between 74 and 82 degrees Fahrenheit. But also maintain with a steady temperature.

Heater Watt Size Guide

5 Gallons

10 Gallons

15 Gallons

20 Gallons

75 Gallons

75 Watts

75 Watts

125 Watts

150 Watts

2 x 300 Watts

Tank Size


25 Gallons

40 Gallons

50 Gallons

200 Watts

300 Watts

2 x 200 Watts

I suggest the Fluval M Series Heaters if you don't already have one. They aren't the cheapest on the market, but I've had fantastic luck with them in my fish tank. You can rest assured that your fish will be safe with a Fluval aquarium, as this is a highly dependable brand.

Heater I Recommend For Guppies

Heaters should be placed in close proximity to filters for optimal efficiency.

Where Should You Place The Heater?

Where Should You Place The Heater?

It could get hotter on one side of the tank than the other if it's not placed near the filter.

The filter will aid in re-circulating the heated water throughout the tank, ensuring a consistent temperature throughout.

Don’t Rely Too Much on the Heaters



Finally, most heaters have a temperature indicator, but you shouldn't solely rely on it. You should also monitor the temperature of your tank with a thermometer. The Marina Floating Thermometer is my go-to thermometer because it's both affordable and dependable.

For More Information

For More Information

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