Lambda Heat Pumps for Home Assistant (Marketplace integration)

Installs: 329 sharing analytics
GitHub stars: 64
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: V2.8.6, October 22, 2026
Category: Climate, Heat pumps and air conditioning
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: lambda_heat_pumps
Source: github.com/GuidoJeuken-6512/lambda_heat_pumps
Issues: Report an issue

Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation.

About

Lambda Heat Pumps connects Home Assistant to Lambda heat pumps locally over Modbus/TCP. It detects the available modules, such as heat pumps, boilers, buffers, solar modules and heating circuits, and creates matching entities. It provides climate entities for heating, cooling and hot water, number entities for heating curve points and offsets, and a large set of sensors. Sensors include cycling counters and energy consumption by operating mode, with daily, monthly and yearly figures. Options cover temperature ranges, room thermostat control with external sensors, PV surplus control, optional cooling setpoints and the update interval. It is set up in the UI, and Home Assistant can discover it on the network.

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Supports

Works locally Talks to your devices on your own network. No vendor cloud in between.
Found by itself Home Assistant spots it on the network and offers to add it.
From the Marketplace Installed through the Marketplace, formerly HACS.
Actively maintained Its author released or pushed a change in the last six months.

Provides

Climate
Sensors

Setting it up

Install it from the Marketplace and restart Home Assistant, then add it under Settings, Devices and services.

Lambda WP Setup

Name
Host
Port
Slave ID
Firmware Version
Number of heat pumps
Number of boilers
Number of heating circuits
Number of buffers
Number of solar modules
Use legacy Modbus names

Reconfigure Lambda WP

Name
Host
Port
Slave ID
Firmware Version

After setup

Hot Water Min Temperature
Hot Water Max Temperature
Heating Circuit Min Temperature
Heating Circuit Max Temperature
Temperature Step
Firmware VersionSelect the firmware version of your Lambda heat pump
Room Thermostat ControlEnable integration with external room thermostats
PV Surplus ControlEnable PV surplus control for optimized energy consumption
E-Meter Measuring Point
Cooling ModeCreates an additional climate entity per heating circuit for the cooling mode setpoint
Update Interval (seconds)Update interval for Modbus queries (10-300 seconds). Lower values = more frequent updates, but more Modbus traffic.
Room Temperature Sensor (HC 1)
Room Temperature Sensor (HC 2)
Room Temperature Sensor (HC 3)
Room Temperature Sensor (HC 4)
Room Temperature Sensor (HC 5)
Room Temperature Sensor (HC 6)
Room Temperature Sensor (HC 7)
Room Temperature Sensor (HC 8)
Room Temperature Sensor (HC 9)
Room Temperature Sensor (HC 10)
Room Temperature Sensor (HC 11)
Room Temperature Sensor (HC 12)
PV Power Sensor

Texts from the code of GuidoJeuken-6512/lambda_heat_pumps.

Entities

ClimateHeating Circuit, Cooling Circuit, Hot Water
NumbersCold Point -22°C, Mid Point 0°C, Warm Point +22°C, Room Temperature Offset, Room Temperature Factor, Flow Line Offset, Eco Temperature Reduction
SensorsBuffer High Temp Setpoint, Collector Temperature, Energy Total, Maximum Buffer Temperature, Current Power, Request Flow Setpoint, Request Heat Sink Delta Setpoint, Request Return Setpoint, Storage Temperature, Error State, Error Number, State, and 144 more

From the README

Für die deutsche Anleitung bitte weiter unten schauen.
Full Modbus/TCP Support: Complete support for Lambda heat pumps via Modbus/TCP
Automatic Module Detection: Auto-detects available modules and creates appropriate entities
Cycling Sensors: Comprehensive cycling counters for all operating modes (heating, hot water, cooling, defrost)
Total, daily, yesterday, 2h, and 4h cycling sensors
Automatic daily reset at midnight
Configurable cycling offsets for counter adjustments
Energy Consumption Sensors: Detailed energy tracking by operating mode
Heating, hot water, cooling, and defrost energy consumption
Monthly and yearly energy consumption tracking
Configurable source sensors with automatic unit conversion (Wh/kWh/MWh)
Smart sensor change detection to prevent incorrect calculations
Heating Curve Configuration: Number entities for easy adjustment of heating curve support points