How many devices can one Wiser Plug support as an RF signal range extender? Follow The Wiser Plug can support up to 6 Wiser devices (Wiser Radiator thermostats or Room Thermostats). Related articles Wiser RF Range Extender Guide 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 What voltage does the Wiser Plug support? Which thermostats are required to control the Wiser Electrical Heat Switch? Comments 0 comments Please sign in to leave a comment.