--- title: "Lambda Heat Pumps" description: "Lambda Heat Pumps is a Marketplace integration for Home Assistant. It has 329 installs sharing analytics, works locally and was last updated October 22, 2026." canonical: "https://vulpo.app/integrations/marketplace/guidojeuken-6512-lambda-heat-pumps" url: "https://vulpo.app/integrations/marketplace/guidojeuken-6512-lambda-heat-pumps.md" last-updated: "2026-10-22" version: "1.4" --- # Lambda Heat Pumps > Lambda Heat Pumps is a Marketplace integration for Home Assistant. It has 329 installs sharing analytics, works locally and was last updated October 22, 2026. 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. Automatic summary of the README and code of GuidoJeuken-6512/lambda\_heat\_pumps. Something wrong, or are you the maintainer and want your own text here? [Get in touch](https://vulpo.app/contact) [Open in My Home Assistant](https://my.home-assistant.io/redirect/hacs_repository/?owner=GuidoJeuken-6512&repository=lambda_heat_pumps&category=integration) On Home Assistant 2026.11 or newer? [Open it in the Marketplace](https://my.home-assistant.io/redirect/marketplace_repository/?owner=GuidoJeuken-6512&repository=lambda_heat_pumps&category=integration) ## 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. ## 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 Version**: Select the firmware version of your Lambda heat pump - **Room Thermostat Control**: Enable integration with external room thermostats - **PV Surplus Control**: Enable PV surplus control for optimized energy consumption - **E-Meter Measuring Point** - **Cooling Mode**: Creates 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](https://github.com/GuidoJeuken-6512/lambda_heat_pumps). ## Entities - **Climate**: Heating Circuit, Cooling Circuit, Hot Water - **Numbers**: Cold Point -22°C, Mid Point 0°C, Warm Point +22°C, Room Temperature Offset, Room Temperature Factor, Flow Line Offset, Eco Temperature Reduction - **Sensors**: Buffer 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 From the README of [GuidoJeuken-6512/lambda\_heat\_pumps](https://github.com/GuidoJeuken-6512/lambda_heat_pumps#readme), [MIT License](https://spdx.org/licenses/MIT.html). Shortened. ## At a glance - Kind: Marketplace integration - Category: [Climate](https://vulpo.app/integrations/category/climate.md), Heat pumps and air conditioning - Number: 329 installs sharing analytics; 64 GitHub stars - Connection: Works locally - Upkeep: Updated in the last 6 months - Needs: Needs the Marketplace (HACS on 2026.10 and older) - Latest version: V2.8.6, last updated October 22, 2026 - Domain: `lambda_heat_pumps` - Source: - Issues: In Vulpo: Climate card, Chart card, Apple Watch, Climate Live Activity (Pro) [Widgets & Live Activities in Vulpo](https://vulpo.app/features/widgets-and-live-activities) Independent directory, made by the developer of Vulpo. Not affiliated with Home Assistant or the Open Home Foundation. [About these numbers](https://vulpo.app/integrations/about) Last updated 2026-10-22. Source: https://vulpo.app/integrations/marketplace/guidojeuken-6512-lambda-heat-pumps --- - HTML version of this page: https://vulpo.app/integrations/marketplace/guidojeuken-6512-lambda-heat-pumps - Site index for agents: https://vulpo.app/llms.txt - Everything in one document: https://vulpo.app/llms-full.txt - All pages: https://vulpo.app/sitemap.xml