Item type: Fish Tank Heater_x000D_ Material: stainless steel _x000D_ Voltage: CN 220V_x000D_ Options: 25W, 50W, 100W, 200W, 300W, 500W_x000D_ TypeLength(cm/in)Suitable fish tank size(cm/in)_x000D_ 25W17.5/6.920-30/7.9-11.8_x000D_ 50W17.5/6.930-40/11.8-15.7_x000D_ 100W29/11.440-60/15.7-23.6_x000D_ 200W29/11.460-80/23.6-31.5_x000D_ 300W37/15.680-100/31.5-39.4_x000D_ 500W37/15.6100-120/39.4-47.2_x000D_ _x000D_ Suitable for aquarium size calculation:_x000D_ Wattage of heating bars required = (fish tank length fish tank width water level height) 1000 2 1Automatic constant temperature, accurate temperature control 12-34 , the temperature difference is very small. 2Using nickel-chromium electric heating wire with better thermal conductivity, it can quickly gather heat, and the heating speed is faster and more stable. 3Step heating, the effect is to heat for 3-7 minutes, pause for 2 minutes, so cycle until the temperature reaches the set temperature. 4Stainless steel shell, high strength, broken-resistant, heat-resisting, durable. 5More control range, 12-34 C, you can choose, automatic temperature control. 6Double layer waterproof and electricity leakage.1. The heating rod is forbidden to leave the water surface;_x000D_ 2. Do not install the suction cup holder to the heating part position;_x000D_ 3. It is strictly forbidden to pull out the hot rod knob. If it is pulled out, please do not use it.1 xFish Tank Heater