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Best Pond Heater for Koi

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The best pond heater for koi fish really depends on whether you just need a small hole in the ice or want little to no ice. If you only need a small hole kept open at the water surface to have gases exchange throughout the winter, then the K&H 8001 Thermo-Pond 3.1 De-Icer comes highly rated for your needs. If you would like a pond heater that keeps the water in most or all of your pond ice-free for the entire winter, then a submersible pond heater such as the K&H Perfect Climate Deluxe Pond De-Icer is your best option.

 Pond Heater for KoiK&H 8001 Thermo-Pond 3.0 Pond De-Icer Review

The K&H Thermo-Pond 3.0 uses only 100 watts of power costing you just a few dollars a month to keep an area of your pond de-iced. It floats on top of the water surface and is rated for up to 1000 gallons. It’s designed to never overheat or burn plastic liners. It doesn’t keep your entire pond ice free. Instead it warms the water immediately surrounding the heater. This allows for a hole in which air can pass through. It has been tested to -30 degrees F and has proven to keep a hole de-iced even when surrounding ice is several inches thick. If you pond is larger than 1000 gallons, you can put several of these in the water to add additional air holes throughout the winter. The plastic design prevents lime build up on the device from the water.

If you choose the K& H 800 Thermo-Pond De-icer, keep in mind that it is not a true pond heater. It is meant to only keep a hole in the ice for air exchange. It works best if placed before it starts to freeze. If your pond has already frozen over, even with just an inch of ice, you will need to drill a hole to place the Thermo-Pond into. It is not hot enough to melt through ice; rather it only prevents ice from forming around it.

pond deicerK&H Perfect Climate Deluxe Pond De-Icer Review

The K&H Perfect Climate Deluxe Pond De-Icer is more of a true pond heater for koi and many customers say it is the best pond heater for its price and operation.  It comes in three different wattages; 250, 750, and 1500. This allows you to get the right wattage for the size of your pond and for how cold your region gets.

This sits on the bottom and heats the water around it, preventing the water from icing over. It has protective covers on the heating elements to prevent the pond lining and fish from becoming burned.

Need to know what size de-icer to buy? K&H makes following wattage recommendations for the K&H Perfect Climate Deluxe Pond De-Icer:

-10 to -20 degrees F:

  • 0 to 400 gallons: 250 watt,
  • 400 to 1000 gallons: 750 watt 1000 to 1200 gallons: 1500 watt


0 to -10 degrees F:

  • 0 to 750 gallons: 250 watt
  • 750 to 1200 gallons: 750 watt


20 to 0 degrees F:

  • 0 to 1000 gallons: 250 watt
  • 1000 to 1200 gallons: 750 watt

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