Keep your betta happy， healthy and swimming in comfort with the Marina Betta Submersible Aquarium Heater. This 8-watt， submersible heater helps create the ideal water conditions for your betta to thrive in bowls and tanks up to 1.5 gallons. It’s designed to automatically reach and maintain a set temperature， which means you don’t need to make any manual adjustments. The exterior of the heater is made of durable polymer， so it’s more resilient than traditional glass sleeve heaters， and the red indicator light illuminates to let you know the heater is working. For your convenience， the included suction cup allows you to easily install it inside your aquarium.