Viessmann Vitocal 300-A (5.8–10.5 kW)

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR410A5.8–10.5 kW

Manufacturer	Viessmann
Model	Vitocal 300-A
Model code	AWO-AC 301.B11
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 & cooling
Heating capacity	5.8–10.5 kW
Max heating output (low temp)	10.5 kW at A-7/W35
COP (heating)	5 at A7/W35
Operating range (air)	-20 to 40 °C
Heating flow temperature	up to 65 °C
Electrical supply	380-415V (Three Phase)
Cooling capacity	8.11 kW
Max cooling output (high temp)	6.38 kW at A35/W7
Dimensions (H×W×D)	1980 × 1100 × 1100 mm
Operational Weight	250 kg
Sound power level	53 dB(A) (Sound Power LW(A))
Data added	2026-09-26
Data source	Manufacturer documentation (Viessmann)
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.	BSI KM 554512/13/1
MCS certification	✓ MCS listed
MCS certificate no.	BSI KM 554512/13/1

Free data sheet (PDF) →

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

View manufacturer page →

Viessmann Vitocal 300-A AWO-AC 301.B11, air-to-water heat pump, R410A. 12.0 kW at A7/W35 with a COP of 5.0. Flow to 65 C.

Where to buy (UK)

UK Supplier	Secon Renewables
UK Supplier	Pirate Heating Supplies
UK Supplier	Beet BG
UK Supplier	GetPlumb
UK Supplier	Solar Trading

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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.