Danfoss Randall FHV-R Regulating Valve for Underfloor Heating with Sensor FJVRDanfoss Randall FHV R Regulating Valve for Underfloor Heating with Sensor FJVR FHV R provides temperature control of underfloor heating circuits, using a return temperature limiting valve fitted with a FJVR sensor element. FHV R is used in applications where a desired floor temperature is required (e. g. a bathroom where a constantly warm floor is preferred regardless of room temperature to ensure comfort & to quickly dry water on the floor). The set