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There are so many de-icers to choose from. What size do I need? | Decorative Ponds & Water Gardens Q & A

Q: There are so many de-icers to choose from. What size do I need?

Q: There are so many de-icers to choose from. What size do I need?

Pia – Spokane, WA

A: A de-icer is an important piece of equipment in areas where water features freeze over during the winter. This little device maintains a small opening in the ice, which allows harmful gas to escape into the air allowing for efficient air exchange. It can be the difference between life and death for the fish and other inhabitants in your pond.

Which de-icer is best for your situation? It will depend on how many gallons your pond holds, and if you’re using it alone or with an aeration system.

First, here’s what we recommend for de-icers based on the size of your pond:

  • Up to 250 gallons: 100 to 250 watt de-icer
  • 250 to 500 gallons: 300 watt de-icer
  • 500 to 1,000 gallons: 750 watt de-icer
  • 1,000 to 1,500 gallons: 1,250 watt de-icer
  • 1,500 to 2,000 gallons: 1,500 watt de-icer

K&H™ Perfect Climate™ Pond De-Icer comes in 250-, 750- and 1,500 watt options. The thermostatically controlled de-icer is designed for floating or submersible use. Farm Innovator’s Floating Pond De-Icer, pumps out 1,250 watts of ice-melting power. It’s also thermostatically controlled and turns on when water temperature drops below 35°F.

These de-icers do a great job, but keep in mind that they can be expensive to run non-stop during the cold months. A 1,500 watt de-icer can cost up to $75.00 to operate. That’s a big bill for a small hole!

That’s where an aeration system comes into play.

Aeration systems – can help maintain a hole in the ice while adding oxygen and are infinitely more energy-efficient than pond de-icers. When used in tandem, aeration can significantly reduce the wattage requirements of your pond de-icer, allowing the use of a smaller 100 watt de-icer. It’ll cut energy costs and save you money all season long. For example a 2,000 gallon pond using the PondAir™ 4 and 100 Watt Thermo-Pond De-Icer will cost $5.40 per month instead of $75.00 using a de-icer alone. Not a bad deal!

If you decide to go this route – and why wouldn’t you? – Select the Airmax® PondAir™ and Thermo-Pond 3.0 De-Icer Combo. The combo comes with either the Airmax® PondAir™ 2 (for ponds 1,000 gallons or less) or the Airmax® PondAir™ 4 (for ponds 2,000 gallons or less). Both the PondAir™ 2 and PondAir™ 4 includes: air stones, check valves, black vinyl air tubing and the 100 Watt Thermo-Pond De-Icer. For an additional charge, you can also throw in a Mini Boulder TrueRock™ Cover to protect the air compressor.

De-icers are important, but they don’t have to break the bank. Invest in an aerator-de-icer combo and save your money for something you really want – like some new koi!

Pond Talk:What parts of your winter landscape do you most look forward to?

Safeguard Your Fish This Winter - PondAir (t) 2 & Thermo-Pond De-Icer Combo

Do I need a heater to overwinter my fish in the pond? | Decorative Ponds & Water Gardens Q & A

Q: Do I need a heater to overwinter my fish in the pond?

Q: Do I need a heater to overwinter my fish in the pond?

Pat – Far Hills, NJ

A: Unless you house warm-water fish like Plecostomus in your water feature, you won’t need a heater to heat things up. Most pond fishes, including koi and goldfish, will overwinter just fine in their outdoor digs because they go into a pseudo-hibernation state when water temperatures fall. Their metabolisms slow and they’re able to tolerate cooler water—even water that’s frigid enough to freeze.

If you live in a climate that experience those freezing temperatures, what we recommend is a de-icer or aerator (rather than a heater) to keep a hole in the ice. This hole allows for gas exchange, through which necessary gases like oxygen enter and harmful gases like ammonia escape.

Which option is right for you?

  • De-Icer: A de-icer’s purpose is to float on the surface and melt a hole in ice that has formed on a container of water, whether a koi pond or water garden. Unlike a heater that actually warms the entire body of water, a de-icer like the K&H™ Thermo-Pond 3.0 Pond De-Icer simply melts an opening in the ice sheet, thereby allowing for gas exchange.
  • Aerator: Rather than create a hole in the ice from above, an aerator, like the PondAir™ Aeration Kit, circulates the water below the ice sheet. In areas with relatively mild winters, that subsurface water movement will keep a hole in the ice that allows for gas exchange—but when temps really dip, an aerator may not be enough to maintain a vent hole.
  • De-Icer, Aerator Combo: An excellent and convenient option to consider is the PondAir™ & Thermo-Pond Combo. It combines both the Thermo-Pond and PondAir™ Aeration Kit, providing your water feature the one-two punch it needs to stay well-vented throughout the winter.

If temperatures in your area vary between above- and below-freezing, consider installing a ThermoCube®. The thermostatically controlled outlet turns on when air temperatures drop below 35° Fahrenheit and turns off when air temps rise above 45°F. This handy-dandy device will save you money, which is something we can all appreciate!

Pond Talk: What do you do to keep your finned pals comfortable in the winter?

The Ultimate in Winter Pond Protection - View Airmax® PondAir™ & Thermo-Pond Combo

Do I need to heat the water in my pond in order for my fish to survive the winter? | Decorative Ponds & Water Gardens Q & A

Do I need to heat the water in my pond in order for my fish to survive the winter?

Q: Do I need to heat the water in my pond in order for my fish to survive the winter?

Kimberly – Bradford, PA

A: We all love central heating or a roaring fireplace in our homes when winter’s chilly temperatures roll in, but your pond fish—specifically your koi and common goldfish—don’t need those creature comforts to stay happy and content.

Cold Temps and Torpor

During the winter months when the water temperature is 45 to 50 degrees Fahrenheit and below, koi and goldfish enter into a dormant state. The technical term for this is torpor, and it means that the fishes’ metabolism and activity slows, they become very lethargic, and they require little nourishment. In this state, the koi and goldfish will, in fact, be quite comfortable in temperatures as low as 35 degrees.

Demystifying De-icers

If koi and goldfish don’t need the water warmed, what’s the deal with pond heaters and de-icers, like the Thermo-Pond, Farm Innovators or Perfect Climate™ de-icers?

These tools of the trade aren’t intended to turn up the heat in your pond’s water. They’re designed to simply melt a hole in the ice, which allows dangerous gases to escape while letting fresh and life-sustaining oxygen. When plugged into the Thermo Cube® Thermostatically Controlled Outlet, the de-icers will turn on when temps dip to 35 degrees and off when temps rise to 45 degrees on their own. To save even more on energy costs this winter, consider installing a PondAir™ & Thermo-Pond 3.0 aeration and pond de-icer combo. When used with an aeration system, you can use a lower wattage de-icer which will not need to be ran as often to maintain an open ventilation hole.

De-icer’s Limitations

But the one thing de-icers don’t do: actively circulate or move the water like an aeration system does. That agitating action is necessary to trap and bring oxygen into the pond’s entire water column—including the bottom, where the fishes are snoozing. It also helps to prevent ice from forming a complete sheet on the pond surface.

Though running a pump will help move the water, it doesn’t agitate it enough to get those O2 levels up. A pump also costs more to operate than an aeration system, and, if ice does form, you could do some major damage to the unit from poor water flow. If you do not yet own an aeration system for your water garden, the PondAir™ & Thermo-Pond 3.0 Combo is a surefire way to protect your fish this winter.

Pond Talk: How do you keep a hole in the ice on your pond or water garden during the winter?

PondAir™ & Thermo-Pond 3.0 Combo - Protect Your Fish This Winter

What are winter fish kills and how can I prevent them? – Decorative Ponds & Water Gardens Q & A

Dyed Pond


Q: What are winter fish kills and how can I prevent them? – Alison in Illinois

Winter Fish Kills, They Don’t Float With Us!
You’ve waited all Winter long for the ice to melt over your water garden so you can run your waterfalls and enjoy your finned friends. Instead, you find your fish floating at the ponds surface, victims of a winter fish kill. What is this phenomenon and how can you prevent it?

Make Some Holes
When a layer of ice forms over the surface of you water garden, it essentially eliminates any transfer of air to or from your pond’s water. What this means to you is that, as debris decompose and your fish consume oxygen, byproducts are produced in the form of gasses that are toxic to your pond’s inhabitants. These gases are trapped under the ice and cannot escape; fresh air from outside the pond cannot reach the water either and so begins the process of the winter fish kill. Keeping a hole in the ice will allow the bad air in the pond to be replenished with good air. Some pond guys and gals use pond De-Icers to maintain an open hole, but many more rely on their aeration systems to do the job.

Pass The Bubbly
We’ve discussed in our past blogs the many benefits of aeration in your water garden. It circulates the water in your pond, infusing it with oxygen which is beneficial to your bacteria and fish. The constant bubbling produced by an aeration system will also keep a hole open in your water garden in the winter months, ensuring the release of those harmful gasses.

Being Supercool is SO Uncool
You have all heard concerns expressed in our past blogs in regards to “supercooling”. While this is a rare occurrence, there are a couple steps you can take to ensure you don’t overdo your winter aeration. When the cold weather comes, move your aeration plates to a shallower part of your pond. This will maintain a warmer layer of water for your fish to retreat to if the water does get a little too chilly. Furthermore, if you have a multiple plate system, you can run your water garden on just one plate for the winter. This will ensure that you have an open hole in your ice and should provide sufficient air supply to your fish as they require less oxygen during these times of decreased activity.

POND TALK: What type of aeration do you use in your pond? How have your fish fared over the past winters?

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