Stiebel Eltron ISG for Home Assistant (Marketplace integration)

Installs: 912 sharing analytics
GitHub stars: 106
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: 2026.9, October 26, 2026
Category: Climate, Heat pumps and air conditioning
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: stiebel_eltron_isg
Source: github.com/pail23/stiebel_eltron_isg_component
Issues: Report an issue

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

About

Stiebel Eltron ISG connects Home Assistant to a Stiebel Eltron ISG heat pump gateway over local Modbus TCP. It works without the Stiebel Eltron cloud or a Web-Monitoring subscription. It adds sensors, binary sensors, climate controls for several heat circuits, number settings for comfort and eco temperature targets, an operation mode select, SG Ready switches and a heat pump reset button. Supported controller families include WPM 3, WPM 3i, WPMsystem and several LWZ models, and compatible Tecalor devices can also be used. Setup happens in the UI with the ISG host and Modbus port, and Home Assistant may discover the device on the network. It also offers diagnostics and repair notices.

Automatic summary of the README and code of pail23/stiebel_eltron_isg_component. Something wrong, or are you the maintainer and want your own text here? Get in touch

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
Switches
Sensors

Setting it up

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

Connect

The IP address of the Stiebel Eltron ISGThe IP address or hostname of the Stiebel Eltron ISG web server.
The TCP port of the Stiebel Eltron ISG (e.g. 502)The Modbus TCP port of the ISG (default: 502).

Change the connection

HostThe IP address or hostname of the Stiebel Eltron ISG web server.
PortThe Modbus TCP port of the ISG (default: 502).

Texts from the code of pail23/stiebel_eltron_isg_component.

Entities

Binary sensorsCirculation Pump, Pump HK1, Pump HK2, Heat-up Program, NHZ Stages Running, Is Heating, Is Heating Boiler, Compressor, Is in Summer Mode, Is Cooling, Evaporator Defrost, Power Off (EVU), and 45 more
ButtonsReset Heatpump
ClimateHeat Circuit 1, Heat Circuit 2, Heat Circuit 3, Heat Circuit 4, Heat Circuit 5
NumbersComfort Temperature Target HK1, Eco Temperature Target HK1, Comfort Temperature Target HK2, Eco Temperature Target HK2, Comfort Temperature Target HK3, Comfort Temperature Target HK4, Comfort Temperature Target HK5, Eco Temperature Target HK3, Eco Temperature Target HK4, Eco Temperature Target HK5, Dual Mode Temperature HZG, Comfort Water Temperature Target, and 26 more
SelectsOperation Mode
SensorsActual Temperature, Target Temperature, Actual Temperature FEK, Target Temperature FEK, Humidity, Humidity HK 1, Humidity HK 2, Humidity HK 3, Humidity HK 4, Humidity HK 5, Dew Point Temperature, Dew Point Temperature HK 1, and 131 more
SwitchesSG Ready Active, SG Ready Input 1, SG Ready Input 2

Troubleshooting

DiagnosticsDownloads a diagnostics file to attach to a bug report.
Repair noticesNotices it can show in Settings, Repairs:Unavailable duplicate entities, Unsupported controller model