Blauberg S21 for Home Assistant (Marketplace integration)

Installs: 52 sharing analytics
GitHub stars: 16
Connection: Works locally
Upkeep: Updated in the last 6 months
Version: v0.6.2, September 29, 2026
Category: Climate, Fans and ventilation
Kind: Marketplace integration
Needs: Needs the Marketplace (HACS on 2026.10 and older)
Domain: blauberg_s21
Source: github.com/jvitkauskas/homeassistant_blauberg_s21
Issues: Report an issue

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

About

Blauberg S21 controls a Blauberg S21 ventilation unit locally over Modbus TCP. It adds a climate entity that handles power, HVAC mode, target temperature and fan mode, with the current temperature taken from the supply outlet. Alongside it come sensors for temperatures, humidity, pressure, airflow and fan speed, plus binary sensors for filter, problem, boost, heating and cooling states. Buttons reset the filter timer and alarm, numbers set manual fan, bypass and rotor values, selects pick bypass and rotor modes, and switches cover the timer and weekly schedule. Heating and cooling activity comes from the controller's own operation bits, and all readings share one poll. Setup runs in the UI, either by choosing a device found by network discovery or by entering the host and port by hand.

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Supports

Works locally Talks to your devices on your own network. No vendor cloud in between.
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.

Enter the address

Host
Port

Also asked when changing the connection.

Select a device

Device

Texts from the code of jvitkauskas/homeassistant_blauberg_s21.

Entities

Binary sensorsFilter needs attention, Problem, Boost active, Heating active, Cooling active
ButtonsReset filter timer, Reset alarm
NumbersManual fan speed, Manual bypass/rotor position, Manual rotor speed
SelectsBypass mode, Rotor mode
SensorsSupply temperature, Intake temperature, Extract temperature, Exhaust temperature, Humidity, Supply pressure, Extract pressure, Supply airflow, Extract airflow, Supply fan speed, Extract fan speed, Supply fan performance, and 8 more
SwitchesTimer, Weekly schedule