Why use a heat pump for your koi pond
Easy Install
Simple Operation
Prevents Winter Stress
Extends Season
Stable Water Temperatures
Protect Koi Health
Energy Efficient
Low Operating Cost
20+Years HEATING KOI PONDS






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Keep Your Koi Healthy with Thermotec Heat Pumps
Maintaining a stable pond temperature (e.g., +12°C) throughout winter and spring offers significant health benefits for koi, reducing stress and helping prevent diseases and parasite attacks. Stable temperatures avoid harmful fluctuations, supporting koi immune systems and overall well-being.
Heat pumps, like those in the Thermotec Inverter range, are an efficient way to heat koi ponds year-round, significantly reducing heating costs compared to gas boilers or electric heaters.

Operates Down to -15°C

Programmable Accuracy of ±0.5°

High Heat Output at Low Air Temperatures
SELECT YOUR HEAT PUMP
Thermotec Inverter Edge Pond Sizing Guide
Select the right model based on your pond’s volume. For expert advice, contact our team.
| Model | Max Pond Volume (Gallons) |
|---|---|
| Thermotec Edge 10.5kW (12kW Boost) | 4,500 |
| Thermotec Edge 13.5kW (15kW Boost) | 6,000 |
| Thermotec Edge 16kW (18kW Boost) | 7,500 |
| Thermotec Edge 20.5kW (22kW Boost) | 9,600 |
| Thermotec Edge 24kW (26kW Boost) | 11,600 |
| Thermotec Edge 26kW (28kW Boost) | 13,800 |
| Thermotec Edge 30kW (32kW Boost) | 19,900 |
| Thermotec Edge 30kW (32kW Boost 3-Phase) | 19,900 |
Note: The maximum pond volume indicates the capacity each model can effectively heat, based on standard conditions. For precise sizing tailored to your pond, consult HeatPumps4Pools for expert advice.
Select Your Heat Pump!
Key Koi Pond Products...

Thermotec Inverter Edge Horizontal Heat Pump
Thermotec Inverter Edge Horizontal Heat Pump with Wi-Fi for Swimming Pools or Koi Ponds.
See our sizing guide above and ensure you are getting the correct capacity heat pump for your pond!
Add To Cart – 10.5kW (12kW Boost)Most customers start with the 10.5kW model, but larger options are available!
Add To Cart – 20.5kW (22kW Boost)Need more power? Explore the next size up:
Add To Cart – 30kW (32kW Boost 3-Phase)Want to browse the full product range?
View Full Product RangeFrequently Asked Questions
The Thermotec Inverter Pond Heat Pump is recommended because it operates effectively at low ambient temperatures down to -15°C, making it suitable for year-round use, including in harsh winters. Unlike cheaper models designed for summer, it provides high heat output in cold weather and is fully inverter-driven, automatically adjusting compressor and fan speeds for optimal efficiency with COPs up to 13.
HeatPumps4Pools offers free sizing advice to select the correct Thermotec model based on your pond size – see how table below if you know the size of your pond. The kit includes all necessary parts and full installation instructions. A minimum pond water temperature of +8°C is required for startup, and a backup heater is recommended for extreme cold or emergencies. Ensure the pond is covered to minimize heat loss.
HeatPumps4Pools offers free sizing advice to select the correct Thermotec model based on your pond size – see how table below if you know the size of your pond. The kit includes all necessary parts and full installation instructions. A minimum pond water temperature of +8°C is required for startup, and a backup heater is recommended for extreme cold or emergencies. Ensure the pond is covered to minimise heat loss.
As a rule of thumb, we recommend increasing the power of your heater by 2.5x compared to the sizing table above. However, please contact a member of the team before purchasing to ensure you are getting sufficient capacity.
Most customers require the following – mounting feet to ensure the heat pump does not freeze up over winter (from the condensate); a bypass kit to ensure the flow rate through the heater matches manufacuterer recommendations; and a winter cover.
HeatPumps4Pools provides free technical advice, delivery to most UK postcodes, and worldwide shipping. We have a network of over 150 engineers for repairs and support. Contact them at +44 (0)1268-206560 (9 AM–5 PM, Mon–Sat) or enquiries@heatpumps4pools.com. Our address is Unit 3 Sovereign Business Park, Cranes Farm Road, Basildon, SS14 3JD.