Cobalt Mini Therm 20 watt Heater Cobalt Mini Therm (Plastic) 20 watt Heater Product Description: Cobalt Mini Therm (Plastic) 20 watt Heater The all new Cobalt Aquatics MINI-Therm compact and fully submersible heaters feature a constant ON design, specifically for small aquariums up to 5 gals. The heater casing is made from a thermal-plastic polymer that is shatterproof. An internal ceramic heat radiator that provides even and the best heat distribution from the heating elements. Perfect for freshwater and saltwater aquariums and terrariums. Available in 3 sizes that will raise recommended size aquarium temps up to 10 degree
HEATER SELECTION GUIDE MODEL / AQUARIUMS UP TO 5 W / 1.2 gal (4.5 l) 10 W / 2.4 gal (9.1 l) 20 W / 4.8 gal (18l)
* to raise temperature up to 10 degrees F above ambient temperature.