Air/water splitR410A
Vaillant aroTHERM split
Air-to-water split · 7 models
R410A split system, sold today in 10 and 12 kW (flow temperature 20 to 55 C) with a hydraulic station or uniTOWER. The BAFA list also carries older 3.5 to 7.5 kW sizes (VWL 35/5 to 75/5).
Grant lists
Grants depend on the exact model being on the official list. The counts below are the entries of this series we found in each list.
BAFA WEP (Germany)
10 models listed
10 models of this series are eligible in the BAFA Wärmeerzeuger-Portal, the list the German BEG heat pump grant depends on.
checked November 4, 2026 · See the entries
ZUM (Poland)
12 models listed
12 models of this series are on the Lista ZUM, which the Polish Czyste Powietrze grant requires.
checked November 4, 2026 · See the entries
Specifications
| Type | Air-to-water split |
|---|---|
| Heating output (datasheet) | 10–12 kW |
| Design heat load Pdesignh (35 °C) | 3.2–13.6 kW |
| SCOP at 35 °C | 4.35–4.6 |
| SCOP at 55 °C | 3.25–3.43 |
| Refrigerant | R410A (GWP 2088) |
| Outdoor sound power | 52–54 dB(A) |
| Max. flow temperature | 55 °C |
Heating output is the figure in the manufacturer's datasheet; the basis (nominal output at A7/W35 or B0/W35, or design heat load) differs between brands, so check the datasheet before comparing. * = design heat load Pdesignh at 35 °C from the BAFA portal.
Control and connectivity
| SG Ready | Yes |
|---|---|
| Modbus | Not documented |
| EEBUS | Not documented |
| Cloud API | partner programme (myVAILLANT) – Vaillant Group API developer programme (B2B application, "apply for free trial") |
| §14a EnWG control | via relay input |
| Local interfaces | SG Ready, relay input |
Source: kontakt.vaillant.de/fachpartnernet/startseite/elektro/wae... · www.vaillant.de/api/download/product/de/betriebs--und-ins... · www.vaillant.de/ratgeber/gesetze-und-verordnungen/enwg/
Zerofy
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Models in this series
Model codes as the manufacturer documents them. The official list entries, with their own naming, follow below.
Models on the BAFA list 10
Eligible in the BAFA Wärmeerzeuger-Portal on November 4, 2026. Anlagennummer is the entry's number in the portal; SCOP at 55 °C is derived from the portal's ηs value.
| Model | Anlagennummer | SCOP 35 °C | SCOP 55 °C | Sound | Refrigerant | SG Ready |
|---|---|---|---|---|---|---|
| aroTHERM Split VWL 105/5 (AS/S2) + VWL (127/5 IS / 128/5 IS) | 16010262 | 4.52 | 3.25 | 52.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 105/5 AS 400V S2 + VWL 128/5 IS | 16003238 | 4.52 | 3.25 | 52.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 125/5 (AS/S2) + VWL (127/5 IS / 128/5 IS) | 16003239 | 4.4 | 3.35 | 52.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 125/5 AS S2 + VWL 128/5 IS | 16003240 | 4.4 | 3.35 | 52.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 35/5 (AS/230V/S2) + VWL (57/5 IS / 58/5 IS) | 16010261 | 4.6 | 3.28 | 53.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 35/5 AS 230V S2 + VWL 58/5 IS | 16003126 | 4.6 | 3.28 | 53.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 55/5 (AS/230V/S2) + VWL (57/5 IS / 58/5 IS) | 16003128 | 4.37 | 3.43 | 54.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 55/5 AS 230V S2 + VWL 58/5 IS | 16003127 | 4.37 | 3.43 | 54.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 75/5 (AS/230V/S2) + VWL (77/5 IS / 78/5 IS) | 16003176 | 4.35 | 3.35 | 54.0 dB(A) | R410A | Yes |
| aroTHERM Split VWL 75/5 AS 230V S2 + VWL 78/5 IS | 16003175 | 4.35 | 3.35 | 54.0 dB(A) | R410A | Yes |
Models on the ZUM list 12
On the Lista ZUM on November 4, 2026, with the list's own device number.
| Model | ZUM id |
|---|---|
| VWL 105/5 AS + VWL 127/5 IS | PW-718379 |
| VWL 105/5 AS + VWL 128/5 IS | PW-418130 |
| VWL 105/5 AS 230V + VWL 127/5 IS | PW-818147 |
| VWL 125/5 AS + VWL 127/5 IS | PW-218131 |
| VWL 125/5 AS + VWL 128/5 IS | PW-018132 |
| VWL 125/5 AS 230V + VWL 127/5 IS | PW-618148 |
| VWL 35/5 AS 230V + VWL 57/5 IS | PW-018113 |
| VWL 35/5 AS 230V + VWL 58/5 IS | PW-718124 |
| VWL 55/5 AS 230V + VWL 57/5 IS | PW-418125 |
| VWL 55/5 AS 230V + VWL 58/5 IS | PW-218126 |
| VWL 75/5 AS 230V + VWL 77/5 IS | PW-018127 |
| VWL 75/5 AS 230V + VWL 78/5 IS | PW-818128 |
Entries as published in the official lists on the date shown; names and numbers are copied verbatim. Check the list for your exact model before you order.
More Vaillant heat pumps
Sources
- Datasheet: www.vaillant.de/api/download/product/de/flyer_produktinfo-arotherm-split_1359...
- Product page: www.vaillant.de/produkte/arotherm-split/
- Control and connectivity: kontakt.vaillant.de/fachpartnernet/startseite/elektro/waermepumpen-unterlagen...
- Control and connectivity: www.vaillant.de/api/download/product/de/betriebs--und-installationsanleitung_...
- Control and connectivity: www.vaillant.de/ratgeber/gesetze-und-verordnungen/enwg/
- BAFA Wärmeerzeuger-Portal – Wärmepumpen – checked November 4, 2026
- Lista ZUM (Instytut Ochrony Środowiska) – checked November 4, 2026
- EEBUS certified devices – checked November 2, 2026
All figures are taken from the manufacturers' datasheets and the official BAFA and ZUM lists on the date shown and may have changed since. This is not grant advice – check the list and your grant conditions before you order. Zerofy is not affiliated with any of the manufacturers listed.
SG Ready is a label of the Bundesverband Wärmepumpe (BWP) e.V.; “Yes” means the manufacturer documents the two-input interface or declares it on the BAFA portal, not that the series carries the BWP label – the label list is at waermepumpe.de. EEBUS is a standard of the EEBus Initiative e.V.; Modbus is a registered trademark of Schneider Electric, licensed to the Modbus Organization. Product names, logos and photos belong to their manufacturers and are shown to identify the products. Grant data: BAFA Wärmeerzeuger-Portal and Lista ZUM (IOŚ-PIB) as of the dates shown; the SCOP at 55 °C in the BAFA tables is calculated by Zerofy from the portal's ηs value.
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