Sinking De-Icer rests safely on the bottom of the tank and are so compact they will even fit in small buckets. Comes complete with a metal guard that makes it safe for rubber plastic or structural foam tanks and features a fail-safe shut-off system should the tank run dry as well as built-in thermostatic control. cCSA and ULus Listed.. 1500 watts. 120vac. Wt. 2.7 lbs.