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Daikin Altherma 4 Modbus
Plug-inKeep Altherma 4 controls and readings on your LAN
This integration reads Altherma 4 temperatures, operating states and power over Modbus TCP and adds heating-zone and hot-water controls to Home Assistant, a home automation hub. It also calculates efficiency from available measurements and can use an external electricity meter.
The documented target is the EPSX series with MMI 2.2.0 or later and an Ethernet connection. It requires Home Assistant 2026.9 or later; register availability varies by model and MMI version, and TLS is untested.
- Control your Daikin without Daikin's cloud
- Use your Daikin in your smart home
- Keep your energy and performance history
- Tune your comfort and energy use with your own rules
- Heating and domestic-hot-water entities
- Derived COP using an external power sensor
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