Bell & Gossett D-100 Hydro-Flo water mixing valve is a 1/2-inch thermostatic mixing valve preset to 140°F, designed to temper hot hydronic water by blending it with cooler return water in heating systems. It maintains a fixed outlet temperature, helping downstream components—such as boilers, radiant heating coils, or indirect water heaters—operate at a consistent temperature. From Bell & Gossett's Hydro-Flo line, this compact mixing valve provides a straightforward solution for temperature control in residential or light commercial hydronic installations where precise tempering is required.
