Thermotec Mini Heat Pump 4kw and 5kw UK Plug and Play Pool Heater for Above Ground Pools up to 10m3 Extended Season Use




Thermotec Mini Heat Pump 4kw and 5kw UK Plug and Play Pool Heater for Above Ground Pools up to 10m3

1. Description

 Thermotec Mini 4 and 5kw mini heat pump designed specifically for above ground pools which will can 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 above ground 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 10m3 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



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

Supplied with UK 3-PIN Plug and inline RCD

Thermotec Mini

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)

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


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!

intex pools - hot splash heat pump

Koi Ponds

We do not recommend that the Thermotec Mini are used on koi ponds. As they are a mini heat pump, the heat output will reduce in very cold weather and will probably be insufficient to heat a koi pond in winter.

For koi ponds, we recommend using the Thermotec Inverter heat pumps which work to -15c and can be used all year. They also have larger evaporators (fins) and so can extract more heat in cold weather.

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. Sizing & Models

What size heat pump do I require for my pool?

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

ModelKwMax Pool Volume


Max Pool Volume

(April – Oct)

Thermotec Mini Reversible 4kw Heat Pump4kw8m34 m3
Thermotec Mini Reversible 5kw Heat Pump5kw10m35.5 m3

Please note that these sizes assume that you will 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

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 10m3 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 = 10m3 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 (May-Sept) !

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

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

Thermotec Mini pool heat pump for above ground pools

4. Specifications

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

Thermotec Mini Specifications

5. Optional Extras


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..

Flexi Hosehose-1-5-inch-on-reel.jpgYou 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

Jubilee ClipsJubilee clipsStainless Steel Jubilee Clips 30-50mm
Intex Hose Adaptor BIntex Hose Adaptor BIntex Adaptor B & Bestway to connect 38mm hose to 32mm pools (you will need these if you wish to use the 38mm Intex Hoses with nuts on the end)
1″ to 2″ Threaded Nipple2" - 1" Reducing NippleThe 1″ to 2″ threaded nipple allows a standard Intex or Bestway hose with the grey nut to be connected to the Thermotec Mini heat pump

6. Product Literature

Thermotec Mini Heat Pump Brochure
Thermotec Mini Reversible Heat Pump User Manual

7. Warranty & Support

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.

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.

8. Delivery

Thermotec Mini 4kw & 5kw  pool heat pumps are now in stock. They can then be shipped to any UK address on a 1 – 3 day delivery service.

The price includes FREE UK delivery.

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

9. 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

10. Videos

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


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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