The Thermotec Inverter range of pond heat pumps really do offer the best in terms of efficiency, performance, reliability and low noise operation.
The Thermotec Inverter range are fully inverter driven. This means that they automatically adjust the speed of the fan and compressor to precisely match the heat demand from the pond.
The ability to adjust the output of the heat pump allows the Thermotec Inverter to deliver greatly reduced running costs with COPs of up to 13. This means that for every 1kw of electricity used by the heat pump, 13kw of heat is delivered to the pond. This delivers reduced running costs compared with other heat pumps on the market In addition the inverter technology has a reduced electrical startup requirement, making them ideal for properties with a sensitive or limited electrical supply.
Features Include
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- Fully inverter driven with variable speed fan and compressor to deliver the lowest running costs with maximum heat output
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- High efficiency with COPs of up to 13. This means that for every 1kw of electricity used by the heat pump, 13kw of heat is returned to the pond.
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- The desired water temperature can be adjusted in steps of 0.1 °C.
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- Equipped with an easy to use 5-inch colour touch screen display / control panel.
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- Remote control and monitor your heat pump via an app on your smartphone
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- Remote support from HeatPumps4Pools via the wifi module
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- Top quality Mitsubishi variable speed inverter compressor
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- Brushless variable speed DC fan motor – very efficient with extremely quiet operation
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- Control panel is lockable to prevent tampering with the pool set temperature (useful for rented properties)
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- Display shows temperature & power consumption curves to monitor the performance of the heat pump
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- Six different models:9kw, 12kw, 17kw, 19.5kw, 24.2kw, 28 kw and 34kw
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- All models single phase power (ie 220v to 240v)
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- Suitable for Koi Ponds, swim spas, hot tubs etc
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- Desired water temperature can be set from +10c to +40c
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- Soft start with reduced electrical startup requirements for properties with sensitive or limited power supplies
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- Low noise, variable speed fan.
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- Corrosion resistant case
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- Microprocessor controlled
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- Automatic hot gas defrosting.
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- Suitable for use on Koi Ponds
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- Titanium heat exchanger – resistant to corrosion from chlorine or salt pools.
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- Operates in air temperatures as low as -15 °C.
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- Capable of heating and cooling, all year round.
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- Optional wifi module – control the heat pump from your smartphone or any web browser
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- 3-Year Warranty
The sizing guide for Koi Ponds is:-
For a Koi pond that is heated all year round with a winter temperature of around 12c and a summer temperature of around 20-22c, we recommend the following sizing:-
| MODEL | MAXIMUM POND VOLUME |
| Thermotec Inverter Horizontal 9kw | 4500 gallons |
| Thermotec Inverter Horizontal 12kw | 6000 gallons |
| Thermotec Inverter Horizontal 17kw | 7500 gallons |
| Thermotec Inverter Horizontal 19.5kw | 9600 gallons |
| Thermotec Inverter Horizontal 24kw | 11,600 gallons |
| Thermotec Inverter Vertical 29kw | 13,800 gallons |
| Thermotec Inverter Vertical 34kw | 19,900 gallons |
(Note: This assumes that the pond is covered in winter and that a temperature of +12c is to be maintained over winter)
All Thermotec Inverter heat pumps are for single phase power (ie 220v to 240v) to suit most properties
COP And Performance
By using the latest inverter technology, the Thermotec Inverter can out perform traditional on/off type heat pumps as well as many other inverter driven models.
Even as the outside air temperature falls, the Thermotec Inverter will still perform well, delivering heat to your pond.
The Thermotec Inverter heat pumps can work well with outside air temperatures as low as -15c
The COP (Coefficient of Performance) is the ratio of the amount of heat (in kw) that the heat pump delivers to your pond compared to the electricity that the heat pump uses (in kw)
By using the latest inverter technology, the Thermotec Inverter has COPs up to 13.6. This means that in these conditions, 1kw of electricity consumed by the heat pump will output 13.6kw of heat to your pond !
Extremely Quiet Operation
The Thermotec Inverter range work very silently thanks to a unique internal ventilation system and the inverter technology.
Both the fan and compressor automatically adjust their speed to match the pond heat demand, therefore once the pond is up to temperature, the unit can operate with reduced power consumption and noise.
Colour Touch Screen Controls
The Thermotec Inverter have a unique 5″ colour backlit touch screen control/display panel
This provides easy to use controls
The display will show:-
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- The current pond water temperature
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- The mode (eg heating or cooling)
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- If the timer function has been set
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- If the fan is operating
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- The current time and date
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- The outside ambient temperature
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- If there is a fault, a fault code is displayed to explain the problem
In addition, the display can show:-
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- A graph of the temperature of the pond over time so that you can see how the pond temperature is being maintained by the Thermotec Inverter heat pump
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- A graph of the power consumed by the heat pump over time
The colour display is backlit making it easy to read in low light conditions and also in bright sunlight
Optional Wi-Fi Control
The optional Wi-Fi module allows the Thermotec Inverter to be monitored and controlled from a smartphone or any internet web browser.
The Thermotec Inverter App is available for both Android and iPhone
The Wi-Fi module simply connects to the heat pump via the supplied cable
The module is then joined to your wi-fi network to allow it to communicate with the internet
The wifi module also allows HeatPumps4Pools to provide remote monitoring and support of your heat pump with the ability to change any settings if required. This greatly enhances the speed and efficiency of our technical support.
The Thermotec Inverter app can then be installed into your smart phone to give full remote control and monitoring of your pool heat pump.
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Using the app you can:-
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| The Thermotec Inverter Mobile Phone App |
Note: A a wifi signal is required at the location of the heat pump in order for the wifi module to be able to connect to your wifi.
Please test the strength of the wifi signal eg with a laptop or your smart phone before purchasing the wifi module.
If you do not have a wifi signal at the heat pump’s location, then you can either:-
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- Use a wifi signal extender to boost the signal in the area of the heat pump
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- Use power lan adaptors plugged into mains sockets in the house and the pool shed. You can then connect a wifi extender to the powerlan adaptor in your pool shed to deliver wifi to the wifi module.
Please Contact Us if you need assistance with the wifi configuration
Please also see the YouTube video and user manual for the Wi-Fi module below for more information and installation instructions
Specifications
Winter Cover and Mounting Feet Included
The Thermotec Inverter horizontal range of heat pumps come with:-
2 x Water connection unions (with 50mm glue socket outlets – 1.5″ adaptor bushes available as an option)
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- 1 x Basic Winter cover (heavy duty winter cover available as an option – see below)
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- 4 x Rubber mounting feet (heavy duty mounting blocks available as an option – see below)

Optional Extras:
| Wi-Fi Control | See section 7 above | |
| Heavy Duty Mounting Feet | ![]() |
These heat pumps come with rubber mounting feet (see photo above).
Alternatively you can purchase these heavy duty Mounting Feet.
These raise the unit off the ground by approximately 100mm, and also help to reduce vibration.
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| Bypass Kit | ![]() |
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| Winter Cover | ![]() |
The unit comes with a lightweight winter cover, however we offer a heavy duty cover which will give you added and extended protection against the winter weather
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| Remote Display Kit | ![]() |
The Remote display kit allows the digital display panel to be located away from the heat pump. The kit includes a 20m cable and a mounting box for the display.
It is also possible to have two displays operating with the Thermotec Inverter range.
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Availability
The range of Thermotec Inverter pool heat pumps are now in stock in the UK and can be shipped to any Uk address on a 1 – 3 day delivery service.
Delivery
The price includes FREE UK delivery.
Please note this item is not held in stock at our facility, only available as a delivery option.
Warranty
The Thermotec Inverter heat pumps come with a 3-year warranty on all components:-
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- UK – First year – parts and labour warranty, Years 2 and 3 – parts only warranty, or return to us in the UK (customer pays transport cost)
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- Europe and outside the UK – 3-Year parts only warranty or return to us in the UK (customer pays transport cost). If spare parts are required, they will be sent free of charge to a UK address. If they are to be shipped outside the UK, the customer pays the international shipping cost
We recommend that you retain the pallet and packaging that the heat pump was delivered with in case you need to return the unit to us for repairs under the warranty.
The warranty will not apply where the heat pump has been installed incorrectly, or has been damaged by freezing










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