fish tank heater for aquariumFeature:1. Insulation heating, no leakage: Quartz explosion-proof insulation heating element, non-conductive and leakage-proof.2. Over-temperature protection, do not cook fish: when the water temperature exceeds 35.5 degrees, it will be forced to stop working and alarm.3. Power off from the water, no dry burning: when the heating rod leaves the water surface, it will be forced to stop working and alarm.4. Precise heating, no error: The PID optimization algorithm corrects the temperature in real time, with almost no error.5. 0.5 degree adjustment, accurate temperature control: cyclic setting, increase the temperature by 0.5 degrees once, and so on.describe:It can be calculated according to the amount of water in the fish tank, and 1 liter of water requires 2-2.5w of power to heatThe for calculating the water volume of the fish tank:Length X width X height cm (height: refers to the height of the water level) /1000=*** liters of waterExample fish tank: 100X40X60cm/1000=240 litersCalculate the required heater wattage:240 liters X2w (or 2.5w) = 480WSo you should choose a 500w heating rodSpecification:Power: 50WSuitable for fish tank: 20-30CMSuitable for water body: 20-30LBody size: 12x7x3cmPower cord length: 1.5 metersPower: 100WSuitable for fish tank: 40- 50CMSuitable for water body: 30-50LBody size: 12x7x3cmPower cord length: 1.5 meters200WDimensions: 18x7.5x3.3 cmPower cord length: 1.5 metersTemperature control range: 18- -35°CSuitable for fish tank: 40-60cmSuitable for water body: 60-100LPower: 300WSuitable for fish tank: 60-90CMSuitable for water body: 100-200LBody size: 15x8x3cmPower cord length: 1.7 metersPower: 500WSuitable for fish tank: 90- 120CMSuitable for water body: 200-300LBody size: 21x9x3.5cmPower cord length: 1.7