Obvious ideas often are the best ones. For example, the aquarium heater as a rod. The heating rod is simply hung in the water and heats it. It is true that the principle is still the same as decades ago. But a lot has changed in the meantime. And today the EHEIM adjustable heater is an ultra-modern electronic thermal device with the best available technology. A jacket made from special laboratory glass increases the heating surface, serves as a heat shield and ensures optimum even heat emission. Eheim Product Number 3617110 BOX CONTAINS AQUARIUM THERMOSTAT HEATER 200W

Chrome Nickel coil inside a shock resistant shatterproof glass tube. Heating function is indicated by an on/off control light. Precise temperature control - dial at the top of the heater (65-93F or 18-34C).