Marina C25 Compact Heater, 25-Watt

This heater was designed to reach and maintain the set temperature of 26ºC (78ºF), provided that the maximum difference between the ambient and set temperature is less than 5ºC (9ºF). Variables such as lower room temperature, wide temperature fluctuations, lack of an aquarium cover, presence of pumps and filters or aquarium placement in proximity to cooling sources may require a higher wattage for proper control for the given tank size. If the set temperature is not reached in all conditions, it will probably be necessary to increase the heating power. We recommend monitoring aquarium temperature on a regular basis with a reliable aquarium thermometer.