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flexoTHERM water source heat pump

flexoTHERM and fluoCOLLECT for water source applications

  • MCS accredited and Quiet Mark approved*
  • Ideal for properties that have an accessible water source on-site
  • ErP rated A+++ when installed with VRC 700 or VRC 700f
  • High seasonal SCoP value
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*Excludes 230V range

The fluoCOLLECT water-to-water stainless steel heat exchanger connects to a flexoTHERM heat pump to offer an alternative to ground source.

Water source heat pump systems are ideal for end users that have a suitable water source onsite, such as a lake, river or stream. Using a fluoCOLLECT alongside a flexoTHERM enables end users to take advantage of consistent water temperatures, to produce consistent hot water and heating, even in the coldest of temperatures. With the water source system pipework being submerged, it is also a viable option for projects that are especially aesthetically sensitive and require minimal visual impact, during installation and once completed.

flexoTHERM and fluoCOLLECT are MCS accredited, so may qualify for the RHI scheme.

Features and benefits:

  • Available in 230V and 400V - 230V heat pump is available in 5, 8 and 11kW models. 400V heat pump is available in 5, 8, 11, 15 and 19kW models
  • More power, more efficiency - Integrated EVI super compressor, injects additional refrigerant into the compression cycle
  • Exceptionally quiet - With noise levels as low as a modern refrigerator - 42dB(A), flexoTHERM has earned the ‘Quiet Mark’ approval (excludes 230V range)
  • High quality and sustainable - Green iQ technology aids in future-proofing the product and ensures optimum efficiency performance and sustainability.
  • Ability to cascade up to seven flexoTHERM heat pumps - Suitable for larger domestic and commercial properties.
  • Ideal for aesthetically sensitive projects - Minimal visual impact both during and after installation.



Technical dataUnit5kW 230V8kW 230V11kW 230V5kW 400vV8kW 400V11kW 400V15kW 400V19kW 400V
Dimensions (H x W x D)mm1183 x 595 x 600
fluoCOLLECT dimensions (H x D x W)mm720 x 291 x 733
Weight, with packagingkg161176188155170178185197
Weight, without packagingkg151166178145160168176187
Weight, ready for operationkg157173185151167175187200
Sound power level B0/W35 EN 12102/EN 14511 LWI in heating modedB(A)43.346.950.041.247.945.049.950.6
Inrush current (with inrush current limiter)A1519601519222630
Energy-related Products at 35˚C*bandA+++
Energy-related Products at 55˚C*bandA+++
MCS SCoP performance table
35°C 4.825.104.975.195.625.585.825.55
40°C 4.394.594.484.595.014.965.194.97
45°C 3.964.083.994.004.404.354.564.38
50°C 3.893.963.893.824.264.184.414.27
55°C 3.813.833.793.644.

*Reported efficiency when used with a VRC 700 / VRC700f controller

For further details on the specifications of this products, please download the Technical Specification table/s below:

230V (685 kB)

400V (3392 kB)

Related Products

Related Products

uniSTOR heat pump cylinders

  • Fully compatible with the Vaillant heat pump range
  • Range of options and accessories to cater for a wide range of projects and requirements
  • Superior insulation and efficiency

VRC 700 & VRC 700f

  • Takes care of all Vaillant equipment automatically by intelligently communicating with all Vaillant appliances
  • Flexible time programs
  • Clear, high contrast backlit display

Passive cooling module

  • Passive cooling module for use with ground collector and boreholes
  • Thermally insulated casing
  • Integral diverter valve, mixing valve and heat exchanger


How to get

Request a quote

Vaillant renewable products 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.