Vaillant flexoTHERM exclusive (6.57 kW)

Specifications and technical data

✓ BUS eligibleGround Source (GSHP)ResidentialR410A6.57 kW

Manufacturer	Vaillant
Model	flexoTHERM exclusive
Model code	VWF 57/4
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	6.57 kW
Max heating output (low temp)	5.34 kW at B0/W55
COP (heating)	4.41 at B0/W35
SCOP (heating)	4.97 at W35
Operating range (air)	-22 to 40 °C
Heating flow temperature	up to 65 °C
Power input	11.5 kW
Electrical supply	380-415V (Three Phase)
Dimensions (H×W×D)	1183 × 595 × 600 mm
Operational Weight	145 kg
Sound power level	40.7 dB(A) (Sound Power LW(A))
Price (unit only)	£6,309.77–£7,165.20 (checked 2026-09-30)
Data added	2026-09-14
Data source	Manufacturer technical specification (Vaillant UK)
Verification	Verified by a human
Boiler Upgrade Scheme	✓ BUS eligible — Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026). Grant also needs an MCS-certified installer and a qualifying system design. Funding guide
PEL certificate no.	KIWA 00023/002 HP
MCS certification	✓ MCS listed
MCS certificate no.	KIWA 00023/002 HP

Free data sheet (PDF) →

View manufacturer page →

Vaillant flexoTHERM exclusive 5 kW, 400 V three-phase, drawing heat from a ground loop. R410A refrigerant. Flow temperature up to 65 °C. Indoor floor-standing unit, 1183 mm high. Auxiliary heater with output steps of 2 / 3.5 / 5.5 / 7 / 9 kW.

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.