Fluval M50 premium submersible aquarium heaters are quality manufactured in Europe using superior components and construction. These include the heat and shock resistant borosilicate reflective glass tube, heat resistant techno-polymer conductor harness, high temperature resistant heating element, silver nickel contact points, machine assembled thermostatic blade, computer calibrated thermostat and 16 point quality assurance program. These sleek, compact Fluval heaters can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval "M" series, the reflective technology helps maintain the aquariums' natural look as the heater reflects the colors of the surroundings. Safe for fresh and saltwater aquarium use. Fluval M50 Aquarium Heater is suitable for aquariums up to 15 U.S. gallons. Shipping weight: 1 lb.