TMC Therm 200W Heater The TMC Therm Heaters are a high-quality fully sealed and submersible heater that can be used in many aquatic applications such as reef aquaria or freshwater in a diagonal, vertical or horizontal mounting position. These units have easy to view temperature scale and precise and reliable temperature control making stable temperatures between 20C and 34C easier to obtain at an affordable price. These units also use shatter-proof quartz glass construction, which is durable. Additionally, they feature an on/off LED to easily see if your heater is in operation and a 1.5M lead for easy cable running. At a glance Wattage: 200 Temp range: 20-34 °C Tank Size: 240L Self-regulating temperature control 1.5M cable On/off LED Easy to view temperature scale Can be mounted vertically, horizontally and diagonally