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aroTHERM 5kW, 8kW, 11kW and 15kW

Air-to-water heat pump

  • Blue fin coated evaporator as standard
  • MCS accredited
  • ErP rated A++
Request a quote


aroTHERM is Vaillant’s second generation air-to-water heat pump range. Developed inline with the exacting standards and precision engineering you would expect when you choose Vaillant, this MCS accredited heat pump range will ensure that we have one of the most adaptable heat pump system offerings on the market, ensuring high performance, quality and comfort levels.

Features and benefits:

  • Blue fin coated evaporator as standard - Corrosion protection and water repellent to increase the product life time and efficiency. Helps prevent water ‘sticking’ to the evaporator which can lead to ice build-up making the heat pump go into de-icing. Extra corrosion protection against saline (salty) environments increasing the life of the evaporator
  • Tray and Trace Heater - Ensures a quick de-icing even in the most extreme weather conditions. The 30 watt heater comes on when the heat pump is in de-icing mode to make sure that any water running off the evaporator flows freely from the heat pump
  • Inverter driven technology - Modulating compressor - Heat pump only works as hard as is required to heat the property giving increased system efficiency, lower running costs and a longer lasting appliance
  • Low sound power levels from 58 dBA on the 5kW
  • High quality you expect from Vaillant - Precision German engineering, built with quality at its centre as well as operating in conditions down to -20°C
  • Monobloc hermetically sealed air-to-water heat pump - Quick and easy to install, with only electrical and water connections required most importantly there is no need for F-gas qualifications for installation
  • MCS accredited (may qualify for government incentives)
  • Solid case design with inbuilt anti-vandalism measure
  • ErP rated A++ when installed with the VRC 700



Heat pump type Monoblock air/ water heat pumpMonoblock air/ water heat pumpMonoblock air/ water heat pumpMonoblock air/ water heat pump
Flow/return heating connections, boiler side 1¼ "1¼ "1¼ "1¼ "
Product dimensions, widthmm9701,1031,1031,103
Product dimensions, heightmm8349759751,375
Product dimensions, depthmm408463463463
Net weightkg86102126165
Hydraulic lines material CopperCopperCopperCopper
Hydraulic connections material BrassBrassBrassBrass
Hydraulic seals material EPDMEPDMEPDMEPDM
Plate heat exchanger material AISI 304 stainless steelAISI 304 stainless steelAISI 304 stainless steelAISI 304 stainless steel
Pump casing material Painted cast ironPainted cast ironPainted cast ironPainted cast iron
Pollution rating 2222
Supply voltage / frequencyV/Hz230/50230/50230/50230/50
Fuse type T4AT4AT4AT4A
Inverter controller fuseA/VHRC 20/550HRC 20/550HRC 20/550HRC 20/550
Level of protection IP 25IP 25IP 25IP 25
Maximum start-up currentA16162025
Maximum current consumptionA16162025
Pump power consumptionW15 - 7015 - 7015 - 706 - 87
Fan power consumptionW15 - 4215 - 4215 - 7615 - 76 (2 x fan)
Electrical classification llll
Overvoltage category llllllll
Fan rotational speedrpm550550700600
Sound power level for A7W35 according to EN 12102 and EN ISO 9614-1dB(A)58596565
Sound power level for A7W45 according to EN 12102 and EN ISO 9614-1dB(A)58596565
Sound power level for A7W55 according to EN 12102 and EN ISO 9614-1dB(A)58606666
Maximum DHW flow temperature°C60636363
Minimum air temperature (heating and cylinder charging)°C-15-20-20-20
Maximum air temperature (heating)°C28282828
Maximum air temperature (cylinder charging)°C46464646
Maximum air flowm3/h2,0002,7003,4005,500
ErP rating (@ 35°C)  A++A++A+A++
ErP rating (@ 55°C)  A+A++A+A+
Heating circuit
Minimum operating pressurebar0.
Maximum operating pressurebar3.
Heating circuit water contents in the heat pumpl1.
Minimum heating circuit water contentsl17213560
Minimum volume flow ratel/h3803805401,200
Nominal volume flow ratel/h8601,4001,9002,590
Hydraulic pressure differencembar640450300370


How to get

Request a quote

Vaillant Commercial boilers and accessories are available over the counter or as a next day service at most plumbing and heating merchants throughout the UK.

We can provide you with bespoke solutions to accommodate a variety of installations. To discuss your requirements please contact us.

Alternative products

Alternative products

aroTHERM hybrid air source heat pump

  • Unique triVAL® intelligent control system
  • Compatible with all boiler systems
  • Excellent green credentials

geoTHERM 22kW, 30kW, 38kW and 46kW

  • Mircogeneration Certification Scheme (MCS) accredited
  • Vaillant weather compensated controls included
  • 10 guarantee on the compressor

flexoTHERM 230V 5kW, 8kW and 11kW

  • Connects to two different sources - Ground or water
  • ErP rated A+++ when installed with VRC 700 or VRC 700f
  • "Quiet Mark" accredited by the Noise Abatement Society

flexoTHERM 400V 5, 8,11,15 and 19kW

  • Connects to three different sources - ground, water or air
  • ErP rated A+++ when installed with VRC 700
  • "Quiet Mark" accredited by the Noise Abatement Society