Penn-Plax Cascade Heat Aquarium Heater – 13.5” Length – 300 Watt

The Penn Plax fully submersible aquarium heater is a great buy that guarantees easy temperature maintenance for aquarium owners. With a sleek and durable design, it comes preset at 76 degrees Fahrenheit and has a thermometer down the front with actual degrees that allows users to set the temperature they want, as opposed to having to guess and adjust continually. The temperature is clearly visible inside the heater, which means the guessing game is over. It is easy to install and comes with rubber suction cups that hold the heater securely to the aquarium. While the majority of reviews from customers are positive, it should be noted that there were a few negative experiences with the product. In one instance, after a few weeks, the temperature rose and became unreliable.