Photo: Heiztechnik
Air/water splitR452B
Heiztechnik Calla Verde S
Air-to-water split · 8 models
Split version of the Calla Verde with the same outdoor unit sizes (5 to 20 kW at A7/W35), R452B, flow up to 65 °C and operation down to -25 °C. The refrigerant circuit ends in a Split Box, either an add-on to the Basic, Comfort and Comfort II modules or built into the Style hydrobox; Style and Comfort have a 9 kW heater in 3/6/9 kW steps. Figures are for the current "A" version (03.2025 sheets).
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)
No model on the list
No model of this series is in the BAFA Wärmeerzeuger-Portal, so it cannot be funded under the German BEG grant.
checked November 4, 2026
ZUM (Poland)
8 models listed
8 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) | 5–20 kW |
| SCOP at 35 °C | 4.09–4.76 |
| SCOP at 55 °C | 3.23–3.68 |
| Refrigerant | R452B (GWP 676) |
| Outdoor sound power | 46–55 dB(A) |
| Max. flow temperature | 65 °C |
| Built-in backup heater | 9 kW |
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 | not confirmed (BragerOne) – via the HT-tronic connect 1000 internet module supplied with the heat pump (WiFi only) |
| §14a EnWG control | not confirmed |
| Local interfaces | SG Ready |
Source: heiztechnik.pl/wp-content/uploads/2025/04/CATALOG_CALLA_E... · heiztechnik.pl/wp-content/uploads/2020/11/Instrukcja-HT_1...
Zerofy
Via SG ReadyZerofy has no native Heiztechnik integration yet, but this series has an SG Ready input: Zerofy can switch it through a Shelly relay on the SG Ready terminals.
Models in this series
Model codes as the manufacturer documents them. The official list entries, with their own naming, follow below.
Models on the ZUM list 8
On the Lista ZUM on November 4, 2026, with the list's own device number.
| Model | ZUM id |
|---|---|
| Calla Verde S 12A | PW-016741 |
| Calla Verde S 14A | PW-717394 |
| Calla Verde S 16A | PW-417395 |
| Calla Verde S 5A | PW-917393 |
| Calla Verde S 9A | PW-416739 |
| Calla Verde S18A | PW-217396 |
| Calla Verde S20A | PW-017397 |
| Calla Verde S7A | PW-717030 |
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.
Sources
- Datasheet: heiztechnik.pl/wp-content/uploads/2025/03/KATALOG_CALLA_03_2025_www.pdf
- Product page: heiztechnik.pl/produkty-kategoria/calla-verde-split/
- Control and connectivity: heiztechnik.pl/wp-content/uploads/2025/04/CATALOG_CALLA_EN_03_2025_www.pdf
- Control and connectivity: heiztechnik.pl/wp-content/uploads/2020/11/Instrukcja-HT_1000_UZYT.pdf
- 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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