# \[App\]\[Pro\] Kaisai Modbus

**URL:** <https://community.homey.app/t/app-pro-kaisai-modbus/153121>\
**Category:** Apps\
**Tags:** app, homey-pro\
**Created:** [March 29, 2026, 9:52pm UTC](https://community.homey.app/t/app-pro-kaisai-modbus/153121 "2026-03-29T21:52:48Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kaoh](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/kaoh/32/9283_2.png) [@Kaoh](https://community.homey.app/u/Kaoh)\
**Post date:** [March 29, 2026, 9:52pm UTC](https://community.homey.app/t/app-pro-kaisai-modbus/153121/1 "2026-03-29T21:52:48Z")

</div>

Monitor and control your Kaisai Air-to-Water Heat Pump directly from Homey — no cloud, no delays. This app communicates locally over Modbus TCP through an RS485-to-TCP gateway, giving you fast, reliable access to your heat pump’s data and controls.

What you can do:

- Switch heating/cooling on or off and set operation mode (Heat, Cool, Auto)
- Adjust water target temperature and DHW (hot water) target temperature
- Monitor live temperatures: water outlet, water inlet, outdoor, room, DHW tank, and backup heater
- Track energy usage: electrical power consumption, thermal output, and real-time COP
- Monitor water flow rate
- View system status: compressor, water pump, defrost cycle, and outdoor unit activity
- Control DHW heating and silent mode
- Get notified on errors with automatic alarm detection and error codes
- Build automations with flow triggers, conditions, and actions for all key parameters

Requirements:

- Kaisai Air-to-Water Heat Pump (AWHP) with Modbus RTU support
- RS485-to-TCP serial gateway (like Elfin EW-11 or compatible) connected to the heat pump’s H1/H2 Modbus port
- Homey Pro with local network access to the gateway

TEST Version  
[Kaisai Modbus AWHP | Homey](https://homey.app/en-nl/app/com.kaoh.kaisaimodbus/Kaisai-Modbus-AWHP/test/)

RELEASE Version  
pending approval