The Cobalt Aquatics Neo-Glass fully submersible electronic heaters bring the legendary Neo-Therm state of the art electronic thermostat technology and reliability to glass heaters with a ±0.7°F accuracy. An easy to set and read push-button thermostat and digital temperature display makes this highly advanced heater easy to use. Borosilicate glass tube construction provides superior heat and shock resistance and surrounds a high quality, solid ceramic heat radiator that provides the best even heat distribution. Perfect for freshwater and saltwater aquariums. Available in 25-300 watt sizes. Fully submersible heater Easy temperature setting Electronic Thermostat computer tested, accurate ±0.7°F Easy to read temperature scale Ceramic heat radiator Borosilicate glass for superior heat and shock resistance