Can KNX Keypads be Located in a Bathroom?
As the KNX bus is SELV (Safety Extra Low Voltage) there are no restrictions on placement. The only caveat is the effect the moisture may have on the device.
If KNX is being used for climate control then the keypads will need to be in the bathroom to read the temperature. If this is not possible then a temperature probe will need to be installed in the room. This can either be connected to a local keypad or an analogue input depending on the devices used.