Thanks to the patented bi-metal technology, which does not warm up unlike other conventional control heaters, the heater EDEN RCA 300 always responds to the current water temperature. In this way, even the smallest deviations of the pre-set temperature can be avoided. The precise adjustment of the thermostat control is possible through a second patented system. This can be used to correct any deviations between the set and the temperature measured by a separate thermometer. This technique enables a constant water temperature without strong fluctuations. The control heater RCA 300 is extremely robust, durable and can be easily installed in the aquarium with the accompanying holder. The built-in control light shows the activated heating function clearly visible.This text is machine translated.