I have a wellis spa, with Gecko in.touch.3, this does not have an Homey app.
Workarround is to install Gecko in Home-assistant, and then import the device into Homey.
But the Homey device has a temperature limit of 35deg (a bit cold for a SPA), i’m not sure if this limitation is with the home-assistant device in Homey, or a general max setting for temperature in the temperature control of Homey.
Even setting the temperature with a flow (39.5deg), will only set temperature of the SPA to 35deg.
In Home-assistant temperature can be set to max 40deg.
Bug fix / workarround ?
It’s not a max temperature for Homey, my tado hot water controls can go up to 65º
It’s likely a limitation set by the Homey app that your device uses (app developers have to define the min/max temperature in the driver manifest).
I made a workarround…
Install Home-Assistant community app (as the Athom app is very restrictive and filters the allowed devices).
The community app allows the control of the SPA temperature. Hence the bug is with Athom official home-assistant app.
Temperature can also be script controlled in home assistant.
In Home assistant add a helper device, and scripts to set SPA temperature based on the helper state. The Helper can be added to Homey. The Homey flows / devices can activate the helper.