The Webstone TMV is designed for use in heating as well as domestic water systems and provides outlet temperatures ranging between 95°-131° F. The valve may be positioned in any orientation; designated lengths of straight piping before and after the unit are not required. The Webstone Thermostatic Mixing Valve is a SAFETY VALVE. Inspect the TMV at least once per year to verify it is operating correctly. It may be necessary to check the valve more frequently in installations with poor or unknown water quality. Use of a filter or strainer is required for installations with poor or unknown water quality.