KZ Owners please look here - Newbie needs help

Thanks spadoctor. Sounds like I flushed correctly. I don't know if I have a connection to flush the blackwater tank but I did use the wand you mentioned.

As far as the water heater, I definitely know I must fill it first, my question was more whether or not the on off switch under the panel outside was what actually initiated the filling.

I appreciate the help.