Wolf Climate Control ISM8
marcschmiedchen/home-assistant-wolf_ism8 · vv4.5
WOLF ISM8 -- HVAC integration for Home Assistant
In Apple Home through HomeKit Bridge
What HomeKit Bridge makes of each kind of entity this integration creates, read from its source code. A device only gets the ones that apply to it.
| Entity | Shows up as | Note |
|---|---|---|
switch | Switch or outlet | |
binary_sensor | Sensor (motion, contact, leak, smoke…) | |
sensor | Sensor (temperature, humidity, air quality…) | |
button | Button (as a switch) | |
select | Mode picker (as switches) |
What people report
Wolf heating and ventilation units work locally over ISM8; CHA heat pumps sometimes drop or zero power values, likely ISM8 firmware.
- Works4
- Partly works1
| Device | In Home Assistant | In Apple Home | What they said | Source |
|---|---|---|---|---|
| Wolf BM-2 controller | Works Local | Ucount datapoints now create sensors with ISM8 FW 1.90Saved copy… created. They are codes/counters without unit, so state_class is None (no long-term statistics) and the display precision is 0. Works with the current wolf_ism8 release (INT fallback); the explicit decoder is proposed separately in wolf_ism8. As suggested in #94, here is the integration part as a PR. ISM8 FW 1.90 sends DP 372 (last fault code) and the BM-2 datapoints 251 and 355-361 as `DPT_Value_1_Ucount` / `DPT_Value_2_Ucount`. These types were missing from the sensor whitelist, so no entities were created. Changes: - `const.py`: add `DPT_VALUE_1_UCOUNT` / `DPT_VALUE_2_UCOUNT` Excerpt saved from GitHub on 2026-10-23. | PR #96 · 2026-10 | |
| Wolf BWL1S heat pump | Works Local | Listed in READMESaved copySupported devices: Heating Unit 1-4 (TOB, CGB-2, MGK-2, COB-2, TGB-2); Direct heating circuit; Mixed heating circuit 1-3; Cascading module; Solar module SM; Ventilation (CWL Excellent, CWL 2); Heatpump 1-4 (BWL1S, CHA); Controller (BM2). Excerpt saved from the README on 2026-10-23. | README | |
| Wolf CWL Excellent / CWL 2 ventilation | Works Local | Listed; air flow sensor addedSaved copySupported devices: Heating Unit 1-4 (TOB, CGB-2, MGK-2, COB-2, TGB-2); Direct heating circuit; Mixed heating circuit 1-3; Cascading module; Solar module SM; Ventilation (CWL Excellent, CWL 2); Heatpump 1-4 (BWL1S, CHA); Controller (BM2). Excerpt saved from the README on 2026-10-23. | README | |
| Wolf heating units TOB, CGB-2, MGK-2, COB-2, TGB-2 | Works Local | Listed in READMESaved copySupported devices: Heating Unit 1-4 (TOB, CGB-2, MGK-2, COB-2, TGB-2); Direct heating circuit; Mixed heating circuit 1-3; Cascading module; Solar module SM; Ventilation (CWL Excellent, CWL 2); Heatpump 1-4 (BWL1S, CHA); Controller (BM2). Excerpt saved from the README on 2026-10-23. | README | |
| Wolf CHA heat pump | Partly works Local | Power values periodically drop to 0; likely ISM8 firmware 1.80Saved copyHallo, ich nutze die Integration jetzt seit dem September mit unserer neuen CHA-10 samt ISM8 und bin an sich super-happy. Ein sehr effektiver Einblick in die Wärmepumpe, die uns schon zu zahlreichen Verbesserungen im Kleinen geführt hat. Leider haben wir jetzt schon 3 mal bemerkt, dass nach einer längeren Betriebszeit auf einmal einzelne Werte nichtmehr übermittelt werden. Konkret fiel uns das immer bei der Wärmepumpe Leistungaufnahme auf, weil wir diese am häufigsten ansehen. Diese fehlt heute wieder seit 4 Stunden. Aber es betrifft auch weitere Daten. Sinn ergibt das eigentlich nicht, denn … Excerpt saved from GitHub on 2026-10-23. | Issue #67 · 2024-11 |
Gathered from GitHub issues, pull requests, discussions and docs, and from r/homeassistant. These are individual reports, so check the linked thread and the date before you buy.
How it connects
Local push
Talks to the device on your network, and the device tells Home Assistant the moment something changes.
Details
| Installs (analytics) | 73 (0.01%) |
|---|---|
| GitHub stars | 60 |
| Latest version | v4.5 (2026-10-12) |
| Set up in the UI | Yes |
| Maintainers | @marcschmiedchen |
| License | MIT |
Devices listed in its README
- Heating Unit 1-4 (TOB, CGB-2, MGK-2, COB-2, TGB-2)
- Direct heating circuit
- Mixed heating circuit 1-3
- Cascading module
- Solar module SM
- Ventilation (CWL Excellent, CWL 2)
- Heatpump 1-4 (BWL1S, CHA)
- Controller (BM2)
In ReReHome
Whatever HomeKit Bridge shares reaches Apple Home as normal HomeKit accessories behind your Home Assistant bridge, so ReReHome shows and controls them like any other.
Bridges get their own settings page listing the accessories behind them.
