Water temperature is a precondition for any successful hydroponic growing. Too high or too low for the types of plants you're growing and you're going to have big problems. So sort that possibility out with the Hydor Theo Water Heaters, an extremely handy gadget that is fully submersible and will give you precise maintenance of your water temperature. Its uniqueness lies in the heating technology, PTC, patented by Hydor. A special polymer makes up the heating element; it's been silk printed with special ink and when the ink heats up an electric current goes through it that is transferred to the water. The heater's glass tube is shatterproof and it switches off automatically when it's removed from water (if levels go down). The device also operates at a 60°C lower temperature than conventional heaters due to the patented PTC element. An adjustment knob is part of the package.
||22.6cm/8.9" - 50/100ltr - 14/26 gal - 39.4cm/15.5" 200/300ltr - 53/80gal
||39.4cm - 15.5" / 22cm - 8.9"