Preset temperature of 76–78° F
Slim, compact design
Intended for aquariums up to 15 gallons

If you're looking for an easy-to-use heater for your betta fish tank or smaller aquarium, the Fluval P50 heater is a great choice. It is fully waterproof and is designed to be completely shatterproof, which keeps both your tank and livestock safe. Because it is compact and doesn't take up much room, it is easily positioned to fit almost anywhere in the aquarium.

Size: For use in indoor aquariums up to 15 gallons, 50 watts

Dimensions: 1.57 in L x 0.79 in W x 6.1 in H

Temperature: This heater is preset to maintain a temperature of approximately 76–78° F. When the heater is in use, the LED indicator on the front will light up.

Warranty: Guaranteed for defects in material or workmanship for 2 years from the date of purchase

Notes:
— The heater should only be plugged in when the unit is fully submerged underwater, so do not run the heater while it is out of water. Make sure to unplug the heater during water changes so that it won't burn out.
— The heater can be mounted vertically, horizontally, or diagonally, as long as the entire unit remains submerged under water.
— If the difference between the ambient room temperature and the heater’s set temperature is more than 12°F, additional heating capacity may be necessary. Consider using an aquarium lid, adding another heater, or upgrading to a more powerful heater.
— If the temperature is consistently too high, consider removing the aquarium lid or using a less powerful heater.