Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001
The Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001 is an air-to-water heat pump with a SCOP of 4.86 (35 °C) and a sound power level of 48 dB(A). Under permitted development the limit is 37 dB(A) measured 1 m in front of the centre of a neighbour’s habitable-room door or window. Free-standing, the indicative minimum distance is 1.4 m; against a wall 2.0 m.1,2
Key figures
Rules in the UK
Minimum distance to your neighbour
MCS 020(a) (England, permitted development since 29 May 2025)3 · 1 m in front of the centre of a neighbour’s habitable-room door or window
Indicative calculation (hemispherical, no barriers). Not a substitute for an MCS 020 assessment.
Boiler Upgrade Scheme
Check conditions£7,500 – £9,0004Fixed grant (England & Wales)
Fixed grant in England and Wales, deducted from your installer’s quote. £9,000 when replacing oil or LPG off the gas grid (until March 2027). Scotland: Home Energy Scotland grant instead.5,6
- Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
- Rated output 13.61 kW; the scheme covers systems up to 45 kW.
- SCOP at 55 °C: 3.88. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Technical specifications
| General | |
|---|---|
| Type (source) | Air-to-water1 |
| Compressors | 11 |
| Capacity control | Inverter1 |
| Performance | |
| Heating capacity (A7/W35) | 8.5 kW2 |
| Rated output 35 °C | 13.61 kW1 |
| Rated output 55 °C | 13.18 kW1 |
| Min. outdoor temperature | -20 °C2 |
| Efficiency | |
| SCOP (35 °C) | 4.861 |
| SCOP (55 °C) | 3.881 |
| Seasonal efficiency ηs 35 °C | 191 %1 |
| Seasonal efficiency ηs 55 °C | 152 %1 |
| Energy label 35 °C | A+++2 |
| Energy label 55 °C | A+++2 |
| COP A7/W35 | 6.21 |
| COP A2/W35 | 51 |
| COP A-7/W35 | 2.81 |
| Noise | |
| Outdoor unit sound power | 48 dB(A)1 |
| Indoor unit sound power | 40 dB(A)1 |
| Refrigerant | |
| Refrigerant | R2901 |
| Refrigerant GWP | 32 |
| Refrigerant charge | 2 kg1 |
| Electrical | |
| Max. power input | 1.6 kW1 |
| Connectivity & smart | |
| SG Ready | Yes1 |
How it ranks
SCOP (35 °C): better than 61% of comparable models in our database (Heat pumps · Air-to-water · 10–14 kW; n = 308).
Rank 117 of 309
Compared with every model on VersusIndex in the same group with a known value; equal values do not count as better. This says nothing about price, installation or reliability.
Manufacturer documentation
- Datasheet / specifications — Datenblatt Vitocal 250-A
- Brochure / leaflet — Prospekt Vitocal 250-A
External links to Viessmann's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.
Compare with
- Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001vsInventorATS14T/HU160T9
- Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001vsSamsungEHS Mono HT Quiet AE140BXYDGG/EU + AE160DNYMPK/EU
- Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001vsSamsungAE160DXEDGG/EU+AE160DNZSPG/EU
Similar models
Other brands, same type and a comparable size.
More from Viessmann
- Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.19-400-V001 SCOP (35 °C): 4.86
- Viessmann Vitocal 250-A IDU-A Hybrid HWMIW.A1.19-V054 ODU 250-A AWMOF-251.A1.19-400-V002 SCOP (35 °C): 4.86
- Viessmann Vitocal 250-A AWO-E-AC 251.A19 SCOP (35 °C): 4.86
- Viessmann Vitocal 150-A IDU-A AWMIW.A1.19-V052 / ODU 150-A AWMOF-151.A1.16-230-V001 SCOP (35 °C): 4.52
- Viessmann Vitocal 150-A IDU-A AWMIW.A1.19-V052 / ODU 150-A AWMOF-151.A1.16-400-V001 SCOP (35 °C): 4.78
- Viessmann Vitocal 150-A IDU-A Hybrid HWMIW.A1.19-V054 / ODU 150-A AWMOF-151.A1.16-230-V002 SCOP (35 °C): 4.52
Guides on heat pumps
- SCOP, COP and ηs: what a heat pump’s efficiency figures mean
- Hybrid or full heat pump? The main types compared
- Heat pump noise: MCS 020(a), permitted development and where to put the unit
- Sizing a heat pump: heat loss, flow temperature and rated output
- Heat pump refrigerants: R290, R32 and R410A compared
How we collect and check this data →
Frequently asked questions
Can I install the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001 without planning permission?
Under MCS 020(a) (England, permitted development since 29 May 2025) the unit must not exceed 37 dB(A) 1 m in front of the centre of a neighbour’s habitable-room door or window. With a sound power of 48 dB(A) that indicatively means 1.4 m free-standing, 2.0 m against a wall or 2.8 m in a corner. Your MCS installer must confirm this.1,2
How much Boiler Upgrade Scheme grant can you get for the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V001?
£7,500 in England and Wales, provided the product and installer are MCS-certified (£9,000 when replacing oil or LPG off the gas grid, until March 2027). The installer applies and deducts the grant from your quote.1,2
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- MCS 020(a) (England, permitted development since 29 May 2025)
- Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
- Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
- Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026