No, it will not work on Model MHD85245.
No it does not. You have to buy an additional module.
Some models were equipped with it mine was not. I believe it was the natural gas versions that had it built in but don't quote me on that! Mine was electric hybrid. What is odd is I live in Washington state tacoma metro and none of the local stores had in stock. I could not order it online. But I drove down into the Portland Oregon market and all the stores carry it... odd.
Yes it does. I am using it with my H50 T2 RH350BM water heater and the Rheem EcoNet app, and it works great.
Yes, But I can not get it to stay connected to my WIFI. very annoying and I disconnected it. Many complaints on this.
I don't really see any difference.
Yes, but only one account can control the device. You will need to install the app on both phones but use the same account to login into the app to manage the device.
I have no idea. It does have a nice app to control it through anywhere from a cell phone as long as it is connected to WiFi with access to the internet.
I have the hybrid heat pump model and use this WiFi module with it.
Yes the app itself allows more than one water heater working with wink also using one WiFi connection.