25-watt aquarium heater, temperature-controlled aquarium heater with suction cup, built-in thermometer, external temperature controller, suitable for fish and aquariums.

**Versatile Use:** This 25W aquarium heater measures 19.5 x 2.5 x 2.5 cm and is suitable for aquariums up to 30 liters (8 gallons). It is suitable for both freshwater and saltwater aquariums and can be used for fish and turtles. The power cord is 90 mm long. **Safety:** Explosion-proof glass heater. This aquarium heater is made of 2 mm thick quartz glass, which is 33% thicker than standard glass. This makes it less fragile and very safe for both humans and aquatic animals. **Adjustable Temperature:** This aquarium heater features an 8-slot ceramic frame and a multi-strand heating wire for better heat dissipation and a longer lifespan. The adjustable temperature range is between 20°C and 34°C. **Stable and Even Temperature:** Perfect temperature control is ensured by high-quality materials. The borosilicate glass housing is high-temperature resistant, offering significantly improved resistance to explosions and corrosion, as well as excellent thermal conductivity and durability. The nickel-chromium alloy heating wire heats up quickly, and its spiral structure ensures even heat distribution throughout the aquarium – for greater safety and energy efficiency. **Note:** This aquarium heater must be fully submerged to operate. When changing the water or cleaning the aquarium, please turn off the heater and allow it to cool for at least 15 minutes before removing it.