K&H Pet Products Thermo 3.0 Pond Heater, 100-Watt

Last updated date: November 27, 2020

DWYM Score

9.3

K&H Pet Products Thermo 3.0 Pond Heater, 100-Watt

Why Trust DWYM?

DWYM is your trusted product review source. Along with our in-house experts, our team analyzes thousands of product reviews from the most trusted websites. We then create one easy-to-understand review. Learn more.

Look for the DWYM seal for products that are the best in the category.
Show Contents

We looked at the top Pond Heaters and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Pond Heater you should buy.

Editor's Note November 27, 2020:
Checkout The Best Pond Heater for a detailed review of all the top pond heaters.

Overall Take

Able to de-ice 1,000 gallons of water, this pond heater uses only 100 watts of power, keeping your utility bills low. The small, lightweight build creates a small hole in your outdoor pond, maintaining it day after day. It has a built-in thermostat that keeps it from overheating.


In our analysis of 27 expert reviews, the K&H Pet Products K&H Pet Products Thermo 3.0 Pond Heater, 100-Watt placed 1st when we looked at the top 5 products in the category. For the full ranking, see below.

From The Manufacturer

For ponds up to 1000 gallons. The world's most energy-efficient pond heater. Thermo-Pond is a unique pond heater that keeps a hole through the ice in backyard ponds for just pennies a day. In fact, Thermo-Pond can save up to $30.00 a month in electricity VS. those high wattage stock tank style deicers. Just think, Thermo-Pond pays for itself in as little as 2 months. Thermo-Pond floats on top of the water and is thermostatically controlled to never get hot. Unlike some other heaters, Thermo-Pond will never burn a pond liner or plastic pond. It naturally allows the pond to ice over while maintaining a hole through the ice. Allowing that gas exchange can help keep a healthier environment during the winter months Thermo-Pond should be used in ponds that are deep enough to allow plenty of livable water under the iced portion of the pond. MET safety listed. One year limited warranty.

Expert Reviews

Expert Summarized Score

9.8
3 expert reviews

User Summarized Score

8.2
915 user reviews

What experts liked

Works in huge ponds of up to 1,000 gallons. Very energy-efficient, only uses 100 watts of power. Compact and super lightweight. Long lasting design with protected heating element.
- BackyardStyle
Thermostat prevents overheating. Perfect for smaller ponds.
- Modest Fish
Small size is lightweight and easy to put in and take out of the pond. Uses only 100 watts. Won't burn the pond liner. 12-foot power cord. Simple, rugged design. One-year warranty.
- Fish Tank Advisor

What experts didn't like

Short power cord. Nor a very long warranty.
- BackyardStyle
Cord could be longer. Internal thermostat only keeps unit from overheating, doesn’t switch on/off otherwise.
- Modest Fish

An Overview On Pond Heaters

A pond can enhance your outdoor spaces, creating a peaceful retreat in your own back yard. You can even add some small fish and plants to keep it healthy. But unless you live in an area where the temperature is warm year-round, chances are you’ll need to do a few things to protect your pond from cold temperatures.

You have two choices for winterizing your pond: shut it down for the winter or keep it running year-round. The latter requires routinely topping off your pond and monitoring ice buildup. The former means you’ll need to drain the water from the plumbing, remove the pump and oxygenating the water using a recirculating pump.

If you have fish and plant life, though, you’ll need to do what it takes to keep that life healthy even in the coldest temperatures. In colder weather, a sheet of ice will likely form on your pond. The problem with that is that it traps gases in the water, potentially harming the plant and fish life beneath that ice.

A pond heater is the easiest solution. Your pond heater will create a small hole in the ice that allows dangerous gases to escape. Pond heaters typically run on a small electrical current, so you won’t have to worry about excessive electricity usage, even with a larger pond.

The Pond Heater Buying Guide

  • Fish go into hibernation when the water temperature dips below 50 degrees, so make sure you stop feeding them at that point.
  • A de-icer will create a hole in a small section of the pond, which means it will have a maximum capacity. Make sure the pond de-icer you choose can handle your pond size. There’s also the option of using multiple de-icers, spacing them apart to cover the full length of your pond.
  • Since a de-icer floats on top of the water, it could disrupt your outdoor aesthetics. You can buy de-icers that are made to look like a stone, as well as others that have a low profile to keep things looking good.
  • If you have trees near your pond, the autumn months can be rough on it. A net can help keep leaves from getting in the pond, where they’ll fall to the bottom, decay and release gases. When combined with your de-icer, this can help keep your fish and plant life healthy.
  • Safety is important with any electrical appliance. Some de-icers have a built-in thermostat to keep them from overheating.
  • It can be tempting to set your de-icer up and forget about it until spring. But it’s important to check on it when temperatures drop and make sure it’s still doing its job.