Heater for nano-aquarium paludaries and turtles. Vulcano slim is an automatic thermal heater with pre-calibrated internal thermostat that maintains the temperature of fresh or sea water at about 25c. When the pre-set temperature is reached, the product will switch off automatically and then turn on again when the temperature drops by about 2 c. Immerse vulcano slim completely in the water and connect it only a few minutes later. The performance of vulcano slim is directly proportional to the initial room temperature and to the volume of water at a rate of 1 watt lt to obtain a thermal differential of 4c. Therefore in an aquarium of 25lt with an ambient temperature of 21c vulcano slim 25 watt will reach the temperature of 25 c in 12 hour