Vaillant aroTHERM (gen 3) (4.42 kW)

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR410A4.42 kW

Manufacturer	Vaillant
Model	aroTHERM (gen 3)
Model code	aroTHERM VWL 55/3 A 230V
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	4.42 kW
Max heating output (low temp)	4.42 kW at A-7/W35
COP (heating)	4.53 at A7/W35
Operating range (air)	-15 to 28 °C
Heating flow temperature	up to 60 °C
Electrical supply	220-240V (Single Phase)
Dimensions (H×W×D)	834 × 970 × 408 mm
Operational Weight	90 kg
Sound power level	58 dB(A) (Sound Power LW(A))
Data added	2026-10-21
Data source	Vaillant aroTHERM installation instructions 0020217827_03
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 00016/009 HP
MCS certification	✓ MCS listed
MCS certificate no.	KIWA 00016/009 HP

Free data sheet (PDF) →

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

Vaillant aroTHERM VWL 55/3 R410A air-to-water monobloc heat pump (earlier generation), flow up to 60 °C, operation down to -15 °C, single-phase 230 V.

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.