Vaillant aroTHERM Split (6.4 kW)

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR410A6.4 kW

Manufacturer	Vaillant
Model	aroTHERM Split
Model code	aroTHERM split 5kw VWL 55/5 AS 230V S2 + VWL 57/5 IS
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	6.4 kW
Max heating output (low temp)	5.3 kW at A-5/W35
COP (heating)	4.8 at A7/W35
SCOP (heating)	4.62 at W35
Heating flow temperature	up to 55 °C
Electrical supply	220-240V (Single Phase)
Dimensions (H×W×D)	765 × 1100 × 450 mm
Operational Weight	82 kg
Sound power level	54 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 00016/014 HP
MCS certification	✓ MCS listed
MCS certificate no.	KIWA 00016/014 HP

Free data sheet (PDF) →

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

View manufacturer page →

Vaillant aroTHERM Split 5 kW - outdoor unit paired with an indoor hydraulic station. R410A refrigerant, 1.5 kg, pre-filled for up to 15 m of pipe run between the two units (3 to 25 m permitted, 10 m maximum height difference). Flow temperature up to 55 °C in heating and 63 °C for hot water, or 75 °C with the backup heater. 230 V single-phase.

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.