The Baxi 720778601 is a genuine OEM 3-way valve cartridge designed to regulate water flow between the heating and domestic hot water circuits in compatible Baxi, Main, and Potterton boilers. As a key internal component of the diverter system, this cartridge ensures smooth switching between hot water and central heating demands.

A faulty 3-way valve cartridge may cause symptoms such as no hot water, radiators warming up when taps are opened, fluctuating temperatures, or boiler error codes. Replacing it with this genuine Baxi part restores accurate flow control and reliable boiler performance.

Key Features:

• Genuine Baxi 3-way valve cartridge

• Controls water distribution between heating and hot water circuits

• Ensures smooth switching for consistent performance

• Helps resolve temperature fluctuations & hot water issues

• Manufactured to Baxi’s strict OEM quality standards

• Durable and long-lasting design

• Simple, direct-fit replacement for professional installation

Compatibility

The Baxi 720778601 3-Way Valve Cartridge is compatible with selected models across:

• Baxi

• Main

• Potterton

Including (but not limited to):

• Baxi Duo-tec

• Baxi Platinum

• Baxi Combi HE ranges

• Main Combi Eco / Combi HE

• Potterton Promax Combi

Any boiler that lists 720778601 or its equivalent in official documentation will accept this part.

Engineers should always confirm exact compatibility using the boiler’s model-specific parts manual.