Lambda Heat Pumps
GuidoJeuken-6512/lambda_heat_pumps · vV2.8.6
Lambda Wärmepumpe Integration für Home Assistant / Lambda Heat Pump 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 |
|---|---|---|
climate | Thermostat | |
sensor | Sensor (temperature, humidity, air quality…) |
What people report
Modbus integration for Lambda heat pumps; sensor availability depends on firmware level and some 32-bit registers were read with swapped words.
- Works1
- Partly works2
| Device | In Home Assistant | In Apple Home | What they said | Source |
|---|---|---|---|---|
| Lambda EU13 heat pump | Works | Values correct for a contributor on this modelSaved copyDescription Hello, first of all many, many thanks for this great piece of work! When using the lambda_heat-pumps integration for HA, I got wrong values for the entities with a data type of int32. Energy values as shown by lambda: ... and within HA: After some experimenting, I found out, that the reason is swapped double bytes. After changing the coordinates.py file, I could solve the issue. However I think, this is just a workaround and not the proper solution, but hopefully a hint for you. Maybe it is also linked to the hardware/operating system. ### Reproduction Steps HA is installed on a … Excerpt saved from GitHub on 2026-10-23. | Issue #22 · 2025-09 | |
| Lambda EU10L heat pump | Partly works | int32 energy values wrong until register word order swappedSaved copyDescription Hello, first of all many, many thanks for this great piece of work! When using the lambda_heat-pumps integration for HA, I got wrong values for the entities with a data type of int32. Energy values as shown by lambda: ... and within HA: After some experimenting, I found out, that the reason is swapped double bytes. After changing the coordinates.py file, I could solve the issue. However I think, this is just a workaround and not the proper solution, but hopefully a hint for you. Maybe it is also linked to the hardware/operating system. ### Reproduction Steps HA is installed on a … Excerpt saved from GitHub on 2026-10-23. | Issue #22 · 2025-09 | |
| Lambda heat pump firmware 3+ (3K) | Partly works | hc1 flow line setpoint entity removed on firmware 3+; statistics repairs appear after upgradeSaved copyObservations from the same upgrade (2.8.6 → 3.5.6 with the integration firmware option V1.1.0-3K, the pump display shows V1.0.4-3K, see my other report on the register order). These are not bugs in the code, but they cost me time and could be mentioned in the upgrade notes. 1. Setpoint entity: 2.8.6 modelled register 5X07 as `hc1_flow_line_temperature_setpoint` for all firmware. In 3.5 it only exists for firmware levels 1–2; for the V1.1.0-3K option only `hc1_target_temp_flow_line` (read-only) exists. The old entity becomes orphaned, so every dashboard, helper or statistic built on it breaks … Excerpt saved from GitHub on 2026-10-23. | Issue #134 · 2026-10 |
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 polling
Talks to the device on your network, asking it for updates every so often.
Found automatically over
- DHCP
Details
| Installs (analytics) | 322 (0.05%) |
|---|---|
| GitHub stars | 64 |
| Latest version | V2.8.6 (2026-10-22) |
| Set up in the UI | Yes |
| Maintainers | @GuidoJeuken-6512 |
| License | MIT |
Devices listed in its README
- Watt Sensors: Direct usage (e.g., 1500 W)
- Kilowatt Sensors: Automatic conversion (e.g., 1.5 kW → 1500 W)
- Template Sensors: For complex PV surplus calculations
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.
