Viessmann Type 250/150 Low Loss Header, 119 GPM, 4 in. ANSI Flange - 7537707

The Viessmann Type 250/150 low loss header is a hydraulic separator for Viessmann boiler plants, sized for up to 119 GPM with 4 in. ANSI certified flange connections. It keeps the boiler loop and the distribution loop hydraulically independent, an arrangement that multi-boiler Vitodens 200 systems require.

Placed between the boilers and the building piping, the header splits the two circuits so they no longer push against one another. That separation improves how efficiently the plant runs and also helps clear dirt and debris out of the heating water. A shared supply temperature sensor mounted on the header wires to the Vitocontrol-S controller, which reads it to stage the boilers and hold an accurate system supply temperature.

Viessmann makes a low loss header mandatory whenever several Vitodens 200 boilers are installed together, up to four of them. The Type 250/150 stands 57.8 in. high, 25.6 in. wide and 13.8 in. long and weighs 185 lb. This part number is the version with ANSI certified flanges.

Highlights

• Hydraulic break that decouples the boiler circuit from the system circuit

• Rated for a maximum flow of 119 GPM

• 4 in. ANSI certified flange connections

• Common supply temperature sensor connects to the Vitocontrol-S controller

• Required for multiple Vitodens 200 boilers, up to 4 units

Specifications