Grant Btc Sensor Blue Hpas02L All Hpaw Ashe Models

Grant Btc Sensor Blue Hpas02L All Hpaw Ashe Models

 Grant Expansion Vessel 10L – Flat Grey (Part No. MPSS08)
Genuine 10-Litre Expansion Vessel for Grant Vortex Combi 21 Boilers

Product Summary

The Grant MPSS08 10L Flat Grey Expansion Vessel is an essential component of the Grant Vortex Combi 21 heating system. It is specifically designed to absorb pressure fluctuations within the sealed heating circuit, helping maintain optimal boiler pressure and protecting the system from damage due to expansion. This OEM-quality vessel ensures consistent performance and long-term boiler reliability.

Key Features

• Genuine Grant replacement part – guaranteed fit and compatibility

• 10-litre capacity suitable for most domestic sealed systems

• Helps maintain stable boiler pressure and prevent over-pressurisation

• Flat grey design – compact and ideal for internal combi boiler installation

• Heavy-duty membrane construction for durability and long life

• Pre-charged with air, ready for installation

Compatible Boiler Models

• Grant Vortex Combi 21

• May also fit select models in the Grant Vortex Combi range – check boiler manual or contact us for compatibility confirmation.

When to Replace

• If your boiler is losing pressure frequently

• During annual service checks if the vessel fails the pressure test

• When the internal diaphragm is split or perished

• After frequent topping up of the system – a sign the vessel is saturated or failed

Technical Specifications

• Part Number: MPSS08

• Capacity: 10 Litres

• Shape: Flat

• Colour: Grey

• Connection: 3/4" BSP (usually located at rear or side of unit)

• Pre-Charge Pressure: Typically 1.0 bar (verify before install)

• Max Operating Pressure: 3 bar

• Application: For use in sealed heating systems