The Xiaomi Home Assistant has been reported to have an issue with the Viomi Water Heater S1, where the device is not displaying a switch in the HomeKit interface, despite being controllable through the Home Assistant webpage. This issue is similar to the one reported in [Issue#745](https://github.com/XiaoMi/ha_xiaomi_home/issues/745), but specifically affects the Viomi Water Heater S1 (viomi.waterheater.m1). To reproduce this issue, users can follow these steps:
## Step 1: Import the Viomi Water Heater S1 into HomeKit
Users can import the Viomi Water Heater S1 into HomeKit and observe that the device does not display a switch.
## Step 2: Check the Home Assistant Webpage
Users can then check the Home Assistant webpage and verify that the Viomi Water Heater S1 is controllable through the webpage, but the switch is not displayed in HomeKit.
## Expected Behavior
The expected behavior is for the Viomi Water Heater S1 to display a switch in the HomeKit interface, similar to the S2 model.
## System Information
The issue was reported on July 13, 2025, at 22:00, with the following system information:
* Home Assistant Core Version: 2025.7.1
* Home Assistant Operation System Version: 20250702.1
* Xiaomi Home Integration Version: v0.3.4
* Log Timezone: Asia/Shanghai