CTA heat pumps

Air/water monoblocGround source 5 series

CTA AG is a Swiss heat pump manufacturer. On the German BAFA list it has Aeroheat air-to-water units (AH CL, AH CV, AH SCI) and Optiheat brine-to-water and water-to-water units (OH CT, Optiheat Inverta).

Checked October 30, 2026 · Manufacturer website

CTA

Grant lists

BAFA WEP (Germany)

5 / 5 checked November 4, 2026

ZUM (Poland)

0 / 5 checked November 4, 2026

CTA in Zerofy

Zerofy integration

Zerofy reads CTA heat pumps through the manufacturer's cloud, with the account the heat pump is already registered with. Autopilot then moves heat into the building and the hot water tank when your own solar power is available or the electricity price is low.

What Zerofy can do with it:

Heating statusHot water statusHot water boostSolar AutopilotSmart Autopilot (tariff-optimised heating)

Setup guide Heat pump comparison

CTA heat pump types

Air-to-water monoblock3 Ground-source (brine/water)2

CTA Air-to-water monoblock

The whole refrigerant circuit sits in one outdoor unit; only water pipes run into the house. The most common choice for retrofits, because no refrigerant lines need to be installed inside.

Air/water monoblocR290

CTA Aeroheat AH CL

5 models

Output
6.2–17.2 kW
SCOP 35 °C
4.66–5
Max. flow
–
BAFA WEP
5 models listed
ZUM
No model on the list
Zerofy
Native
Details and listed models

Air/water monoblocR290

CTA Aeroheat AH CV

2 models

Output
9–14 kW
SCOP 35 °C
5.3–5.32
Max. flow
–
BAFA WEP
2 models listed
ZUM
No model on the list
Zerofy
Native
Details and listed models

Air/water monoblocR32

CTA Aeroheat AH SCI

1 model

Output
20.5 kW
SCOP 35 °C
4.8
Max. flow
–
BAFA WEP
1 model listed
ZUM
No model on the list
Zerofy
Native
Details and listed models

CTA Ground-source (brine/water)

Draws heat from a borehole or ground loop, so the source stays at a steady temperature all winter. Higher efficiency and no outdoor noise, but boreholes cost money and need a permit.

Ground sourceR290

CTA Optiheat OH CT

4 models

Output
6–16.5 kW
SCOP 35 °C
5.04–5.3
Max. flow
–
BAFA WEP
4 models listed
ZUM
No model on the list
Zerofy
Native
Details and listed models

Ground sourceR410A

CTA Optiheat Inverta

4 models

Output
7–30.4 kW
SCOP 35 °C
5.15–5.4
Max. flow
–
BAFA WEP
4 models listed
ZUM
No model on the list
Zerofy
Native
Details and listed models

CTA series at a glance

Series Type Output SCOP 35 °C SCOP 55 °C Refrigerant Max. flow BAFA WEP ZUM SG Ready Modbus EEBUS
Aeroheat AH CL Air/water monobloc 6.2–17.2 kW* 4.66–5 3.63–3.9 R290 – 5 models listed No model on the list Yes ?Not confirmed ?Not confirmed
Aeroheat AH CV Air/water monobloc 9–14 kW* 5.3–5.32 4–4.05 R290 – 2 models listed No model on the list Yes ?Not confirmed ?Not confirmed
Aeroheat AH SCI Air/water monobloc 20.5 kW* 4.8 3.5 R32 – 1 model listed No model on the list Yes ?Not confirmed ?Not confirmed
Optiheat OH CT Ground source 6–16.5 kW* 5.04–5.3 3.73–3.98 R290 – 4 models listed No model on the list Yes ?Not confirmed ?Not confirmed
Optiheat Inverta Ground source 7–30.4 kW* 5.15–5.4 3.83–3.98 R410A – 4 models listed No model on the list Yes ?Not confirmed ?Not confirmed

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.

Sources

Specifications come from the manufacturer's datasheets linked above, grant status from the official lists below, checked October 30, 2026:

  1. elan1.bafa.bund.de/zvi-ui/wep/waermepumpen
  2. lista-zum.ios.edu.pl/bepub/ben001.aspx
  3. BAFA Wärmeerzeuger-Portal – Wärmepumpen – checked November 4, 2026
  4. Lista ZUM (Instytut Ochrony Środowiska) – checked November 4, 2026
  5. EEBUS certified devices – checked November 2, 2026

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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