Explosion Proof: 2mm thick quartz glass, thicker than ordinary aquarium heater, quartz glass has shatterproof and leakage prevention function, will not be corroded by seawater, it is safer for people and animals using it.

Overheat Protection: You need to set the desired temperature before connecting the power supply. The heating rod will automatically detect the temperature of the water during normal operation. When it reaches the set temperature, it will automatically turn off. The water temperature in the aquarium is lower than the set temperature, it will open automatically.

Adjustable temperature range: Our aquarium heater can be adjusted from 65°F to 92°F (20°C to 34°C). The optimum temperature range for most fish is 76° to 80°F (25-27°C). Some species need to maintain a few degrees of high temperatures, while some species need to lower the temperature by a few degrees.

Simple and practical: Our aquarium heater provide two suction cups for fixing to the aquarium wall. The aquarium heater need to be completely submerged into the water. The 100W aquarium heater is suitable for use in a 20-40 gallon aquarium. We also sent a thermometer for the outside of the aquarium, which is easy to read as the water temperature changes.

Quality Assurance: All aquarium heater offer a 365-day warranty, starting from the time you purchased, during this time if our aquarium heater have any quality problems, we will give you free replacement or refund.