Threre are 3 models avbailable:
extension module for 4 exrta wired room thermostats 230V Model code: UFH-EXTRAZONE-W
extension module for 4 extra wired room thermostats 24V Model code: UFH-EXTRAZ24V-W
extension module for 4 extra wireless room therostats 230V Model code: UFH-EXTRAZONE-R