Vaillant flexoTHERM (flexoTHERM 8 400V)

Specifications and technical data

Ground Source (GSHP)ResidentialR410A8.89 kW

Manufacturer	Vaillant
Model	flexoTHERM
Model code	flexoTHERM 8 400V
Heat pump type	Ground Source (GSHP) All Ground Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R410A All R410A heat pumps →
Mode	Heating only
Heating capacity	8.89 kW
Max heating output (low temp)	8.76 kW at B0/W35
COP (heating)	5.62 at B0/W35
SCOP (heating)	5.34 at W35
Operating range (air)	-10 to 25 °C
Heating flow temperature	25–65 °C
Electrical supply	380-415V (Three Phase)
Dimensions (H×W×D)	1183 × 595 × 600 mm
Operational Weight	167 kg
Sound power level	45.6 dB(A) (Sound Power LW(A))
Price (unit only)	£6,456.88–£7,330.80 (checked 2026-09-30)
Data added	2026-07-02
Data source	Manufacturer Data Sheet
Verification	Verified by a human

Free data sheet (PDF) →

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Vaillant flexoTHERM is a 8 kW ground source heat pump, using R410A refrigerant (model flexoTHERM 8 400V).

Where to buy (UK)

UK Supplier	The Heat Pump Warehouse
UK Supplier	Secon Renewables
UK Supplier	City Plumbing
UK Supplier	Pirate Heating Supplies
UK Supplier	Eco Wizard

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Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.