Questions about SmartThings WiFi Mesh System

Also, it’s not that you buy one repeater. It’s that most of your mains power zwave and zigbee devices will also act as repeaters for the protocol that they use. So it’s just a matter of laying out the backbone appropriately.

Read post 11 in the following FAQ, then go back up to the top of that thread and read the whole thing. It will answer most of the questions about repeaters.