ENERGY SAVING: 3 different wattages of pond deicers for outdoor ponds of virtually any size, see our zone chart to choose the right wattage deicer for your pond in your zone THERMOSTATICALLY CONTROLLED: Deicer is thermostatically controlled to turn on and off as needed to keep your pond from freezing over FLOATING & SUBMERSIBLE: Can be used as a floating pond deicer out of the box or in seconds converts to a submersible pond deicer SAFETY CERTIFIED: This pond heater has been tested & certified by MET Labs to exceed USA/CA electrical safety standards; IMPORTANT! Heating element must be submerged in water at all times when in use COLORADO BRAND YOU TRUST: Designed by K&H with 25+ years of experience in creating safe, innovative, quality products for pets, ensuring safe reliability and top-tier craftsmanship for pet parents SIZE: This model uses 250 watts of power, please refer to our zone chart to see if this is the right choice for your pond in your area IMPORTANT: Keep the heating element free from mineral build up, allowing mineral build up can cause the heater to stop working or trip your GFCI; designed for 110/120 volt electrical current only FOAM: Natural dissolved gases in your water can create foam in or around the deicer due to the temperature change, this is normal and is not toxic, it is natural