Baxi Boiler Hydraulic Inlet Valve (12L) + Automatic Air Vent AAV 5132454 5132455 248043

Product Overview

The Baxi Hydraulic Inlet Valve (12L) with Automatic Air Vent (AAV) Kit (5132454, 5132455 & 248043) is a hydraulic replacement kit designed for use within selected Baxi heating systems.

The hydraulic inlet assembly controls and manages the water supply entering the boiler system, helping maintain correct hydraulic operation. The automatic air vent (AAV) helps remove trapped air from the heating system, supporting efficient circulation and reducing the risk of air-related issues within the appliance.

Together, these components help maintain correct water flow, system filling, and reliable boiler operation.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please check the available options from the dropdown menu.

Technical Insight & Common Failure Symptoms

The hydraulic inlet assembly is part of the boiler's water management system and works with other hydraulic components to control water supply and circulation. The automatic air vent assists by releasing trapped air that can affect system performance.

Over time, hydraulic components may experience wear, scaling, leaks, or internal deterioration.

Typical symptoms linked to a faulty hydraulic inlet valve or automatic air vent include:

• Water leaks from the hydraulic assembly
• Difficulty maintaining correct boiler pressure
• Reduced heating or hot water performance
• Air trapped within the heating system
• Noisy boiler operation caused by air in the system
• Poor circulation or inconsistent boiler performance

Replacing worn hydraulic components may help restore correct water flow, pressure management, and reliable boiler operation.

Compatibility

Manufacturer Part Numbers (MPN):

• 5132454 – Hydraulic Inlet Assembly 12L
• 5132455 – Hydraulic Component Reference
• 248043 – Automatic Air Vent (AAV)

This part is designed for selected models within the Baxi range.

Please strictly verify the manufacturer part numbers 5132454, 5132455 and 248043 against your boiler's technical manual, exploded parts diagram, or existing components before ordering to guarantee correct fitment.

Safety Advice

Boiler hydraulic components involve water pressure, heating system connections, and internal boiler parts. Installation and servicing must be carried out by a Gas Safe registered engineer in accordance with current regulations and manufacturer instructions.