Rheem water heater back on line after separating the 2.4 to 2.4 loT.
FWIW, I recently connected a Rheem hybrid water heater via its app to a standalone RT-AX86U. As is common with IoT devices, the heater uses WiFi Direct to first connect its app for setup... then once you provide it your 2.4 WLAN credentials, the heater proceeds to connect to your 2.4 WLAN and disables its WiFi Direct AP.
However, the app setup would not find the 2.4 Guest WLAN while Smart Connect was enabled using
same 2.4/5.0 SSIDs. So, I temporarily disabled the 5.0 Guest WLAN and then the app setup proceeded to connect the heater to the 2.4 Guest WLAN without issue and disabled its WiFi Direct AP. I then re-enabled the 5.0 Guest WLAN to return to using same SSIDs for 2.4/5.0 Guest WLANs. The heater is now happy using the 2.4 Guest WLAN with Smart Connect enabled using same 2.4/5.0 SSIDs. When VLANs arrive with the next router, I'll configure a dedicated 2.4 only IoT VLAN SSID.
Side note... apparently the app and heater communicate by way of the Rheem cloud so works fine on a Guest WLAN with Internet access only.
This was my first experience with a hybrid water heater... it uses a heat pump to move heat energy from the surrounding ambient air to the water, and exhausts cold air like an air conditioner. When necessary (very cold ambient air and/or peak demand for hot water) it uses a traditional electric heating element.
Here's the 'perfect application' note... this hybrid heater is in an alcove workshop space in an unconditioned garage in Phoenix AZ, that gets HOT daily many days of the year... it blows out cold air like a small window air conditioner, cooling the workshop space (and garage) while heating water... very cool!
OE