Hydor Theo Water Heaters Aquarium heater has all the necessary features for safe and precise temperature maintenance of the water in your tank. The exclusive technology and the high quality of the components guarantee a long lasting product. Submersible, no thermal shock, high impact resistance, graduated scale, vertical and horizontal positioning, precise maintenance of set temperature. Which heater do you need? You can overspec and use more than one heater if you need to.If you had a 400L tank, you would need a 300W heater and 150W heaterYou need 1W per Litre of nutrient - e.g. if you have a 150L tank, you would need a 150W nutrient heater.

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