Eheim Thermocontrol e200 HeaterWith the EHEIM thermocontrol e heating element your fish get the right temperature even more precisely in every aquarium. The EHEIM thermocontrol aquarium control heater is a further development of the legendary heating element and thermocontrol e is the latest electronically controlled variant. The obvious ideas are often the best. This also applies to the aquarium heating element. It is simply hung in the water and heats it up. The principle is the