Marineland - Visi_Therm Submersible Aquarium Heater - 50WFor years, the name Visi-Therm has been the industry standard for excellence in aquarium heater performance and reliability. Now there is the Visi-Therm Deluxe - an advanced-design submersible aquarium heater that constitutes the next important step in aquarium heating technology. Water-calibrated to ensure precise temperature selection and superior performance, the Visi-Therm Deluxe delivers the ultimate in direct-set control, compact double-sealed durability...and certified accuracy to within one degree. With a simple click of the dial, you choose the ideal water temperature. The custom Double-Suction Mounting Bracket features an adjustable three-position window that ensures easy-to-view temperature setting. And, of course, every Visi-Therm Deluxe is CSA listed... designed to exacting standards for extended submersion and operational safety. It is available in 25, 50, 75, 100, 150, 200, 250 300 watt sizes.25Watt - 5 gallon tank 50Watt - 5-20 gallon tanks 75Watt - 5-25 gallon tanks 100Watt - 10-40 gallon tanks 150Watt - 20-50 gallon tanks 200Watt - 25-65 gallon tanks 250Watt - 50+ gallon tanks 300Watt - 55+ gallon tanks - UPC: 47431904392