Every K&H Ultimate Stock Tank Deicer is thermostatically controlled and safe to use in all stock tanks, unlike nearly all of the other deicers available in the market today. No expensive shrouds or cages need be purchased either. Every one of our deicers can be used as a floating deicer out of the box or in seconds converts to a submersible deicer with the click of a button! In the past, all that was readily available were energy gulping 1000 watt to 1500 watt de-icers. Customers had no choice but to purchase these expensive-to-run deicers, even when they didn’t need to. We’ve solved this problem by creating a whole line of deicers along with a convenient zone chart for consumers to choose the correct deicer every time! A free cord safety clip is also included with every deicer. This ingenious clip secures the deicer to the edge of the stock tank, bucket or container to help prevent chewing, cribbing or removal of the de-icer from the tank. MET listed. Two year limited . IMPORTANT! Heating element must be submerged in water at all times when in use.