Viessmann Vitocal 350-A (outdoor installation) (14.5 kW)
Specifications and technical data
✓ BUS eligibleAir Source (ASHP)ResidentialR407C14.5 kW
| Manufacturer | Viessmann |
|---|---|
| Model | Vitocal 350-A (outdoor installation) |
| Model code | AWHO 351.A14 |
| Heat pump type | Air Source (ASHP) All Air Source heat pumps → |
| Application | Residential All Residential heat pumps → |
| Refrigerant | R407C All R407C heat pumps → |
| Mode | Heating only |
| Heating capacity | 14.5 kW |
| Max heating output (low temp) | 14.5 kW at A2/W35 |
| COP (heating) | 3.5 at A2/W35 |
| SCOP (heating) | 3.65 at W35 |
| Operating range (air) | -20 to 35 °C |
| Heating flow temperature | up to 65 °C |
| Electrical supply | 380-415V (Three Phase) |
| Dimensions (H×W×D) | 1885 × 1530 × 1265 mm |
| Operational Weight | 335 kg |
| Sound power level | 59 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 554512/04/5 |
| MCS certification | ✓ MCS listed |
| MCS certificate no. | BSI KM 554512/04/5 |
Check noise at a neighbour’s window (MCS 020 a) →
Viessmann Vitocal 350-A (outdoor installation) AWHO 351.A14, air-to-water heat pump, R407C. 14.5 kW at A2/W35 with a COP of 3.5. 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 |
✎ Suggest a correction to this data
Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.
Alternatives to consider
Three Air Source (ASHP) heat pumps from other manufacturers closest in capacity to this one.
Caernarfon
Global Energy Systems · CAER410MOD1
- Capacity
- 8–14.5 kW
- SCOP
- 4.11 (W35)
- Sound power
- 61.5 dB(A)
HP40 Monobloc, 11kW
Baxi · 7830572
- Capacity
- 11.3–14.6 kW
- SCOP
- 4.67 (W35)
- Sound power
- 65 dB(A)
- Refrigerant
- R32
- Price
- £2,591.67–£3,489.91
WPL A / AC / AS / ACS
Stiebel Eltron · WPL 25 AS
- Capacity
- 7.85–14.3 kW
- SCOP
- 4.39 (W35)
- Sound power
- 54 dB(A)
- Refrigerant
- R410A
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