The Baxi 7683974 is a genuine OEM return block assembly designed for use in selected Baxi Duo-tec, Platinum Compact, and Combi boilers. This hydraulic component forms part of the boiler’s primary return circuit, managing the flow of cooler water back into the heat exchanger.

A worn, cracked, or leaking return block can cause pressure loss, water leaks, circulation faults, inconsistent heating, or boiler lockouts. Replacing it with this genuine Baxi assembly restores correct system flow and ensures safe, efficient boiler operation.

Key Features:

• Genuine Baxi 12L return block assembly

• Controls the return flow into the boiler’s primary circuit

• Designed for Duo-tec, Platinum Compact & Combi ranges

• Ensures stable pressure and proper system circulation

• Helps resolve leaks, flow issues, pressure drops & lockouts

• Robust, heat-resistant construction

• Built to Baxi’s strict OEM quality standards

• Direct-fit replacement for quick, professional installation

Compatibility

The Baxi 7683974 Return Block Assembly is compatible with:

• Baxi Duo-tec (Combi & System)

• Baxi Platinum Compact

• Baxi Combi models

• Boilers listing 7683974 in official Baxi documentation

Common compatible ranges include:

• Duo-tec Combi 24 / 28 / 33 / 40

• Platinum Compact Combi

• Baxi Combi HE and derivatives

Installers should always confirm compatibility using the boiler’s service manual or model-specific parts list.