Grant Expansion Vessel 10Ltr Mpcbs27 541L

Euroflame 50/70 70/90 Internal & External Vortex Pro 15/26 Pre Aug 08

Grant Expansion Vessel 10Ltr – MPCBS27 (541L)

Genuine 10-Litre Expansion Vessel for Grant Oil Boilers – Sealed System Support

The Grant MPCBS27 Expansion Vessel is a genuine 10-litre diaphragm expansion vessel used in sealed central heating systems, specifically designed to work with selected Grant oil-fired boilers. This essential component absorbs the increased volume of water as it expands during heating, preventing over-pressurisation, leaks, and system faults.

The MPCBS27 (541L) vessel is factory-tested and supplied pre-charged, offering a direct-fit replacement during system upgrades, maintenance, or when replacing a failed vessel in your Grant boiler setup.

 Key Features & Benefits

• Official Grant OEM Part – MPCBS27 / 541L
  Manufactured to Grant’s quality standards for guaranteed performance and compatibility.

• 10-Litre Capacity
  Ideal for managing system expansion in medium-capacity sealed systems.

• Diaphragm-Type Design
  Separates air and water with an internal membrane to maintain consistent pressure.

• Pre-Charged and Ready to Install
  Supplied with the correct factory-set pressure (typically 0.8–1.0 bar), saving time on-site.

• Prevents Pressure Surges
  Reduces stress on safety valves, pumps, joints, and other heating components.

• Durable & Long-Lasting Construction
  Built to resist corrosion and temperature fluctuations in high-performance heating systems.

Compatible Grant Boiler Models

The MPCBS27 Expansion Vessel is compatible with:

• ? Grant Vortex and Vortex Eco sealed system boilers (selected models)

• ? Grant boilers where a 10-litre internal or external vessel is specified

• ? Compatible in 541L heating system configurations

Not sure if this part fits your boiler? Contact us with your model or serial number—we’re happy to confirm compatibility.

 When to Replace the Expansion Vessel

Replace the MPCBS27 if:

• You experience frequent boiler pressure drops or spikes

• The existing vessel is waterlogged or fails to hold air charge

• There are signs of corrosion, leaks, or diaphragm failure

• You're replacing other system components (e.g., pressure relief valve or pump)

• As part of routine servicing for older systems

A faulty or failed expansion vessel can lead to boiler lockouts, system inefficiencies, and long-term damage to heating components.

Technical Specifications

• Part Number: MPCBS27 (also referenced as 541L)

• Manufacturer: Grant UK

• Capacity: 10 litres

• Pre-Charge Pressure: 0.8–1.0 bar (adjustable)

• Material: Powder-coated steel with internal butyl diaphragm

• Connection Size: ½” BSP male thread

• Orientation: Vertical or wall-mounted depending on setup

• Application: Sealed heating system pressure control