Vaillant flexoTHERM exclusive (15.78 kW)

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR410A15.78 kW

Manufacturer	Vaillant
Model	flexoTHERM exclusive
Model code	VWF 157/4 + VWA 11/4 SA + VWA 11/4 SA
Heat pump type	Air Source (ASHP) All Air Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R410A All R410A heat pumps →
Mode	Heating only
Heating capacity	15.78 kW
Max heating output (low temp)	15.78 kW at A7/W55
COP (heating)	4.79 at A7/W35
SCOP (heating)	4.43 at W35
Heating flow temperature	up to 65 °C
Electrical supply	380-415V (Three Phase)
Dimensions (H×W×D)	1183 × 595 × 600 mm
Operational Weight	176 kg
Sound power level	48.7 dB(A) (Sound Power LW(A))
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 00023/013 HP
MCS certification	✓ MCS listed
MCS certificate no.	KIWA 00023/013 HP

Free data sheet (PDF) →

Check noise at a neighbour’s window (MCS 020 a) →

View manufacturer page →

Vaillant flexoTHERM exclusive 15 kW, 400 V three-phase, drawing heat from a aroCOLLECT air collector (VWA 11/4 SA, two of them). 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.