aroTHERM Air To Water Heat Pumps

5, 8, 11 & 15kW

  • Four models in the range - 5, 8, 11 and 15kW outputs
  • Quiet Mark accredited
  • Compact in size for easy siting


The aroTHERM range of 5, 8, 11 and 15kW air to water heat pumps are a renewable technology range that generate heat for your home using energy from the outside air.

The aroTHERM heat pump system can help you to significantly save money on your fuel bills and reduce your carbon footprint by reducing your reliance on traditional fossil fuels for home heating, and instead harness energy from natural resources.

Unlike other air to water heat pump systems available on the market, the Vaillant aroTHERM comprises a number of individual components including a heat pump unit, heat exchanger module, weather compensating controls and a choice of either a 6kW back up heater or buffer vessel. As a result, the system is suitable for a broad range of properties, and is also one of the most versatile air to water heat pump systems available on the market.

The system can be fitted into a home heating system with ease and minimal disruption, with the outdoor heat pump unit itself being compact enough to fit underneath a standard window, and being very quiet in operation.

The system provides an excellent solution for off gas properties using oil, LPG or storage heaters in particular, by accessing a sustainable energy source, protecting against fluctuating prices of fuel, and also eliminating the need for fuel storage at home.

What’s more, with a Quiet Mark award you can be assured knowing the aroTHERM is one of quietest heat pumps on the market!

Along with our range of aroTHERM air to water heat pumps, we also offer a hybrid system, making sure we offer one of the most comprehensive renewable heating systems in the UK market. Click here for more information.

Features & Benefits

The aroTHERM air to water heat pump has many welcoming benefits and demonstrates innovative heating technology:

  • With 5, 8, 11 and 15kW models available, the aroTHERM range offers a solution for many types of property.
  • Awarded Quiet Mark approval.
  • To achieve optimum performance, a suitable home will already be well insulated and have a low heat loss. Your installer should carry out a full heat loss calculation taking into consideration the age and size of your property to determine which model is best suited to your home.
  • Normally changing to an air to water heat pump system requires an increase to the radiators to maximise efficiency, and installation can take between 3-5 days.
  • Compact dimensions for flexible siting within a garden.
  • High efficient performance with a co-efficient performance (CoP) of 4.7 meaning for every 1kW of electrical energy used 4.7kW of heat energy are generated (measured at air 7C° and water 35C°)
  • Advance inverter driven compressor ensures even more efficient operation all year round.
  • MCS accredited system and potentially eligible for government funding.
  • Weather compensating controls included as standard.



Monoblock air/ water heat pump
Flow/return heating connections, boiler side11/4;11/4 
Product dimensions, width970 mm1103 mm
Product dimensions, height834 mm975 mm
Product dimensions, depth408 mm463 mm
Net weight90 kg106 kg
Hydraulic lines materialCopperCopper
Hydraulic connections materialBrassBrass
Hydraulic seals materialEPDMEPDM
Plate heat exchanger materialAISI 304 stainless steelAISI 304 stainless steel
Pump casing materialPainted cast ironPainted cast iron
Pollution rating22
Electric connection230/50 V/Hz230/50 V/Hz
Fuse typeT4AT4A
Inveter controller fuseHRC 20/550 A/VHRC 20/550 A/V
Level of protectionIP 25IP 25
Maximum start-up current16 A16 A
Maximum current consumption16 A16 A
Pump power consumption15..70 W15..70 W
Fan power consumption15..42 W15..42 W
Electrical classificationll
Overvoltage categoryllll
Fan rotational speed550 rpm550 rpm
Sound power level for A7W35 according to EN 12102 and EN ISO 9614-158 dB(A)60 dB(A)
Sound power level for A7W45 according to EN 12102 and EN ISO 9614-159 dB(A)60 dB(A)
Sound power level for A7W55 according to EN 12102 and EN ISO 9614-161 dB(A)61 dB(A)
Maximum DHW flow temperature60 °C63 °C
Minimum air temperature (heating and cylinder charging)-15 °C-20 °C
Maximum air temperature (heating)28 °C28 °C
Maximum air temperature (cylinder charging)46 °C46 °C
Max. Air flow2000 m/h2700 m/h
Minimum operating pressure0.1 (1.0) Mpa (bar)0.1 (1.0) Mpa (bar)
Maximum operating pressure0.3 (3.0) Mpa (bar)0.3 (3.0) Mpa (bar)
Heating circuit water contents in the heat pump1,1 l1,6 l
Minimum heating circuit water contents17 l21 l
Min. Volume flow rate380 l380 l
Nominal volume flow rate, max. Volume flow rate860 l/h1400 l/h
Hydraulic pressure difference640 l450 l

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