Thermotec Mini 4 and 5kw Reversible UK Plug and Play Pool Heat Pump for Above Ground Pools up to 12m3




Thermotec Mini 4 and 5kw UK Plug and Play Pool Heat Pump – New for 2023

special offer



 Update Sept 2023 – The Thermotec Mini 5kw with Bluetooth are now in stock in the UK, and reduced for an end of season sale for a limited time only. They have defrost, so can work below +10c, water flow switch and app control using Bluetooth. This is an extended season unit which means it should allow you to use your pool all the way through to October as long as you have a solar cover on the pool and it has been sized correctly for you location. If you are not sure then please call us and we can run through it with you.

1. Description

Thermotec Mini 4 and 5kw mini heat pump designed specifically for above ground pools which will give you extended season use so you can use it from April to October each year, providing it has properly been sized for your pool.

The built in defrost function allows it to work in air temperatures as low as -7c ! (but note that the output of all heat pumps reduces as the air temperature falls)

The Thermotec Mini is a portable Plug and Play Heat Pump, ideal for small paddling swimming pools.

Unlike other mini pool heat pumps, it includes a water flow switch and app control from your smartphone using Bluetooth

 Slash the cost of heating your pool using the Thermotec Mini heat pump rather than an electric heater.

Outputs an incredible 5kw of pool heat from only 1kw (1000 watts) of electricity to give incredibly low running costs.

Plug and play – runs from a standard 13A power socket and comes complete with cable, RCD and UK plug (UK to EU adaptor supplied)

Designed for small above ground pools up to 12m3 of water (pools with a solar cover)



The Thermotec Mini 4 and 5kw heat pumps are incredibly easy to setup for your pool.

The New Thermotec Mini 4 and 5kw outputs up to 4/5kw of pool heat but only uses 0.98kw of electricity!

Thermotec Mini


2. Features

  • Outputs up to 5kw of pool heat from only 0.98kw of electricity used
  • Brand new design
  • Dimensions – 42 x 35 x 38cm (l x w x h)
  • Built in water flow switch – turns off the heat pump when the pool circulation pump stops. Allows you to use a timer with your pool circulation pump. This will then also turn on and off the heat pump
  • Suitable for pools up to 10 (4kw) /12m3 (5kw) of water
  • Desired water temperature can be set to be between 15c and 43c
  • Simple “plug and play” heat pump
  • Comes complete with 4m power cable and with a UK plug/RCD (adaptor)
  • 1.25″/1.5″ (32/38mm) water hosetail connections for standard above ground flexible pool hose
  • Suitable for all above ground pool types eg Intex, Bestway, Doughboy etc..
  • 2 x Metal jubilee hose clips included
  • Operates with outside air temperatures down to -7c !
  • Requires a minimum water flow rate of 1.8m3 an hour from your pump/filter
  • Eco Friendly R32 refrigerant gas
  • No bypass required
  • Easy to operate – easy to use digital control panel, only 3-buttons
  • 3 Button LED display with Bluetooth function – simply set the pool temperature required and the Thermotec Mini will tun on and off as required to maintain the desired pool temperature.
  • Bluetooth function – control the heat pump from your smartphone using the Aqua Temp app
  • Gives much lower running costs than an electric pool heater, 1kw of electricity used outputs approx 5kw of pool heat to your pool!
  • Titanium Heat Exchanger
  • Comes with user manual, drainage, plug, water connections, jubilee clips, power cable, UK adaptor
  • 2-Year Parts Warranty


3. Easy to Use Digital Control Panel

The Thermotec Mini has a easy to use LED display.

Simply use the up and down arrow keys to set your desired pool temperature and the Thermotec Mini  will automatically turn on and off to maintain the desired temperature

thermotec-mini-pool-heat-pump-pic7 digital control panel

4. Supplied with UK 3-PIN Plug and inline RCD


Thermotec Mini

5. Built in Water Flow Switch

The Thermotec Mini has a built in water flow switch.

The water flow switch automatically shuts down the heat pump when there is no (or insufficient) water flow and re-starts it when sufficient water flow is resumed.

This allows the Thermotec Mini to be used in conjunction with a time clock on the pool circulation pump.

When the circulation pump turns off, the Thermotec Mini will shut down and when the circulation pump re-starts, the Thermotec Mini will also re-start.

Note: the Mini should be removed from the plywood base when in use as this is only for transport purposes)

6. Control and Monitor the Thermotec Mini from your Smartphone

A unique feature of the Thermotec mini is the ability to control and monitor it from your smartphone using the Aqua Temp app



Using the app, you can do the following:-

  • See the current pool water temperature
  • Set the desired water temperature
  • Turn the heat pump on and off

If required, you can also see detailed running information of the heat pump including:-

  • Water in temperature
  • Water out temperature
  • Ambient temperature
  • Coil temperature
  • Compressor exhaust temperature
  • etc.

Thermotec Mini Bluetooth


7.   What size heat pump do I require for my pool?

How to Calculate Your pool Water Volume:

You can easily calculate the water volume in your pool as follows: –

Round Pools

To calculate the volume of a round pool, you can use the formula

Pool Volume = 3.14 x radius x radius x depth

  1. Measure the diameter of the pool in metres
  2. Half the diameter to give the radius of the pool
  3. Multiply 3.14 x radius x radius x pool depth


A 12′ (3.66 m) diameter round above ground pool with a depth of 0.8m

Diameter = 12′ x 0.305 = 3.66m

Radius = 3.66 / 2 = 1.83m

Volume = 3.14 x 1.83 x 1.83 x 0.8m = 8.4 m3

The Mini Reversible 4kw supports pools up to 12m3 so this heat pump will be ok for this pool

Note: These sizing’s assume that the pool will be covered with a solar cover when not in use. All pools should have solar covers.

Rectangular Pools

Pool volume = length x width x depth


6m x 4m pool, 0.8 m deep = 6 x 4 x 0.8 = 19.2 m3

Maximum for Mini 5kw Reversible = 12m3 so this heat pump is too small – please look at our SunSpring or Thermotec Neo Inverter Heat Pumps.

Typical Pool Sizes and Volumes

8′ x 30″ Intex above Ground pool = 3.6 m3 – Thermotec Mini Reversible 4kw OK !

10′ x 30″ Intex above Ground pool = 5.5m3 – Thermotec Mini Reversible 4kw OK !

12′ x 36″ Intex above Ground pool = 9.6 m3 – Thermotec Mini Reversible 5kw OK !


The sizing guide for an above-ground covered pool is:-


ModelKwMax Pool Volume

(Warmer areas in the UK)

Max Pool Volume

(Colder areas in the UK)

Absolute Max Pool Volume
(Hotter Climates – Europe)
Thermotec Mini Reversible 4kw Heat Pump4kw10m3
Thermotec Mini Reversible 5kw Heat Pump5kw12m3


Please note that these sizes are based on summer use (May-Sep) to ensure that you maintain a good water temperature as long as you cover the pool with the solar cover for as many hours a day as possible (max 4 hours uncovered). The colder the outside air temperature (including night temperatures as this is the coldest time where you will lose most heat) the larger the heat pump size you will need (kw).

Please call us if you are unsure of the size of heat pump required for your pool

Thermotec Mini pool heat pump for above ground pools

8. Additional Fittings

You may need some of our fittings so that you can add this heat pump to your pool, so please take a look at our Hose pipe and Fittings 

Or call us to get some help with these items.



The Thermotec Mini comes complete with screw in hosetails to take either 32mm (1.25″) or 38mm (1.5″) standard flexible pool hose for above ground pools – ie Intex/Bestway etc..

9. Specifications

Please also see the Specifications tab at the top of the page

Thermotec Mini Specifications

10. Installation

Installation is very easy and straightforward.

The Thermotec Mini is connected to your existing pool pipework

It uses the existing pool circulation pump to pump the pool water through it.

Please see the user manual under the product literature tab at the top of the page, for more information on how to install your Thermotec Mini heat pump

11. Savings

Using the Thermotec Mini heat pump to heat your pool rather than an electric heater will save you money on running costs

The Thermotec Mini only uses 0.98kw of electricity to produce 5kw of pool heat.

If you compare this with an electric pool heater, a 5kw electric pool heater would use 5kw of electricity

The Thermotec Mini therefore is only less than 1/4 the running cost of an electric pool heater – saving you money!

12. Pool Hose

You may need to purchase an additional length of pool hose to connect from your heat pump to the pool

We sell both 1.5″ and 1.25″ pool hose


Please click on this link to add some to your basket – Hose and pipe fittings

the Thermotec mini can also be connected using Intex hose with white nuts on the ends

13. Availability

Thermotec Mini 5kw  pool heat pumps are now in stock. They can then be shipped to any UK address on a 1 – 3 day delivery service.

We expect to have stock of the 4kw model around November 2023, you can pre-order one and it will be delivered once in stock

14. Delivery

The price includes FREE UK delivery.

We can ship the Thermotec Mini heat pumps to any country. Please contact us for a shipping quote.

15. Warranty

The Thermotec Mini Reversible heat pumps come with a 2-year parts warranty

  • 2-years parts warranty on all components in the UK
  • Warranty subject to the unit being installed in accordance with manufacturer’s instructions.

16. Technical Support

We are happy to provide technical support for all swimming pool heat pumps that we supply. Please call us and we will advise you further.

17. Product Literature

Please click the links below to download pdf brochures for these products

Please also see the Product Literature tab at the top of the page

intex pools - hot splash heat pump


18. Assistance

If you need any assistance or advice as to which model would be best for your pool, please feel free to Contact Us

for more information, also see our FAQs page

All items sold in accordance with our terms and conditions

for all enquiries, please contact us at enquiries@heatpumps4pools.com


Thermotec Mini Specifications

Product Literature

Please click the links below to download pdf brochures for these products


Please also see the Product Literature tab at the top of the page


We accept all major credit and debit cards, Bank Transfer (BACS) and Paypal

All major credit cards accepted

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The prices shown include FREE UK delivery for orders over £50 or £6.50 for orders under £50

We can ship to any country. Please contact us for a shipping quote.

The lead time on most items is normally on a 1-2 day delivery,  subject to availability. Please call to check availability.

Additional information

Weight35 kg
Dimensions50 × 52 × 56 cm

4kw, 5kw