Bosch 87107353240 Return Pipe

- Returns cooled system water from the heat exchanger to the return connection.

- Completes the closed hydronic circuit for correct reheating and recirculation.

- Compatible with Bosch HVAC boiler units.

- Formed from a single length of copper tubing.

- Fixed S-shaped bend routes the pipe around surrounding internal components.

- Raised beaded ends at both terminations for sealed connections.

- Drops into the original factory position without cutting, soldering, or field bending.

- Supplied rubber sealing ring and metal gasket seat on the beaded ends.

-Stainless steel retaining clips hold each joint under compression.

- Molded nylon support bracket captured around the tube body keeps the assembly aligned.

- Resists vibration and thermal expansion during operation

- Alternate part number 8-710-735-324-0.

- KWB28-3.

- KWB35-3.

- KWB42-3.

The Bosch 87107353240 return pipe carries cooled system water back from the heat exchanger to the return connection inside compatible Bosch HVAC boiler units, completing the closed hydronic circuit so the appliance can reheat and recirculate water at the correct flow rate. It is formed from a single length of copper tubing bent into a fixed S-shaped profile with raised beaded ends at both terminations, a geometry that routes the pipe around surrounding internal components and allows it to drop straight into its original factory position without cutting, soldering, or field bending. Each beaded end seats the supplied rubber sealing ring and metal gasket and is held under compression by the stainless steel retaining clips, while the molded nylon support bracket captured around the tube body keeps the assembly aligned and stable against vibration and thermal expansion during operation. Supplied as a complete kit with seals and clips for a direct, like-for-like replacement of the original component.