How many devices can one Wiser Plug support as an RF signal range extender? Follow The Wiser Plug can support up to 6 Wiser heating devices (Wiser Radiator thermostats or Room Thermostats). Related articles I bought a smart plug to use as an RF range extender for one of my radiator thermostats. Can I move this plug to another wall socket? (WH) Wiser Plug Instructions Can I plug any electrical device to the Wiser Plug? How many zones does Wiser support? Can the Wiser Plug be used on an extension lead? Comments 0 comments Please sign in to leave a comment.