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Vaillant flexoTHERM Ground Source Heat Pump

  • flexoTHERM is Vaillant’s first heat pump that has flexibility when choosing a renewable source. flexoTHERM with Green iQ offers a modern, refreshing take on the heat pump system that can use three possible heat sources. flexoTHERM is a ground source heat pump, when connected to a group loop, that can be converted to an air source heat pump when connected to aroCOLLECT, or a water source heat pump when connected with fluoCOLLECT.

    The flexoTHERM 400V heat pump model is available in Quiet Mark certified 5kW, 8kW and 15kW outputs, which can be converted to ground, water or air source. flexoTHERM also offers state of the art EVI compressor technology giving extremely high efficiency and heating performance.

    Alongside geoTHERM, flexoTHERM has also been awarded the Quiet Mark thanks to its exceptionally low operating noise levels. It sounds no louder than a standard domestic fridge.


    • Excellent green credentials
    • Significant carbon and energy bill savings
    • Reduced maintenance costs
    • Easy to install and commission
    • Quiet Mark certified 5kW, 8kW and 15kW 400V models
    • Highest ErP rating: A+++ when used with VRC 700 controller
    • High SCoP: The SCoP value for 15kW model is 35°C - 5.22 
    • Flexible source options: Can connect to three different sources - ground, water or air
    • Exceptionally quiet: With noise levels comparable to a modern fridge 
    • State of the art EVI compressor technology 

Sound Made Simple

Acoustics Academy’s Sound Made Simple guide clarifies complex acoustic terminology with insights to design with sound.