Expansion Vessel Repair Kit (Kit 3) 5113000, 248772, 5114691, 181051, 87161425000

Product Overview

The Expansion Vessel Repair Kit (Kit 3) is a servicing kit designed to assist with the maintenance and repair of compatible boiler expansion vessel systems.

This kit contains replacement valve components used to restore the function of an expansion vessel by replacing worn or damaged service parts. Expansion vessels are an important part of sealed heating systems, helping to absorb water expansion as the system heats up and maintaining stable operating pressure.

The repair kit provides a cost-effective alternative to replacing the complete expansion vessel where compatible service components are required.

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

An expansion vessel uses an internal diaphragm and air charge to manage pressure changes within a sealed heating system. Over time, the valve components may become worn, damaged, or require replacement during servicing.

Typical symptoms linked to expansion vessel valve problems include:

• Loss of correct expansion vessel pressure
• Difficulty maintaining stable boiler pressure
• Frequent need to repressurise the heating system
• Pressure fluctuations during heating operation
• Expansion vessel servicing or maintenance requirements
• Water pressure-related boiler issues

Replacing worn valve components may help restore correct expansion vessel operation and improve system reliability.

Kit Contents

The kit includes components designed for expansion vessel servicing, including:

• Valve cores
• Valve removal tool
• Valve extension components

Please refer to the product images for the exact contents supplied.

Compatibility

This repair kit is designed for use with compatible boiler expansion vessel systems across selected heating ranges.

Please strictly verify the part numbers against your boiler's technical manual, exploded parts diagram, or existing expansion vessel components before ordering to guarantee compatibility.

Safety Advice

Boiler pressure components require correct installation and testing. Servicing of expansion vessels and heating systems should be carried out by a suitably qualified heating engineer in accordance with current safety regulations and manufacturer instructions.