The Series 1170/L1170 hot water temperature control valves fromWatts Regulator Company(North Andover, MA) maintain and limit mixed hot water to a desired, selectable temperature chosen by the installer. The 1170 Series can be preset to any temperature between 100 degrees and 180 degrees F and the L1170 between 80 degrees and 120 degrees. Both offer flow rates between 0.5 gpm and 16 gpm.