Grant Expansion Vessel 14Ltr Vortex Combi 36 Mpcbs70

Vortex Combi 36 -Pre Dec 14 Same as Firebird ACC014PVL & Trianco

• Suitable for: Vortex Pro Combi 36kw (pre Dec 2014)

Grant Expansion Vessel 14Ltr – MPCBS70

Genuine 14-Litre Expansion Vessel for Grant Vortex Combi 36 Oil Boilers

The Grant MPCBS70 Expansion Vessel is a genuine 14-litre internal expansion vessel specifically designed for use in the Grant Vortex Combi 36kW oil-fired boiler. This pressurised vessel absorbs excess water pressure as the system heats up, preventing stress on pipework, valves, and other components—an essential part of any sealed heating system.

Whether you're replacing a vessel due to loss of charge, visible corrosion, or pressure issues, the MPCBS70 offers a direct fit for the Combi 36 model and helps restore safe and efficient system operation.

 Key Features & Benefits

• Official Grant OEM Part – MPCBS70
  Engineered to Grant’s original specifications for exact compatibility and performance.

• 14-Litre Capacity
  Sized to handle the expansion of heated water in the Grant Vortex Combi 36 sealed system.

• Internal Diaphragm Design
  Uses a durable rubber diaphragm to separate air and water, maintaining consistent pressure.

• Reduces System Pressure Fluctuations
  Prevents pressure-related faults and protects other key components such as PRVs and pumps.

• Pre-Charged and Ready to Install
  Supplied pressurised to the correct factory setting (usually 0.8–1.0 bar), ready for direct installation.

• Essential for Safe Boiler Operation
  Maintains stable pressure in line with building and boiler safety regulations.

Compatible Grant Boiler Models

The MPCBS70 14Ltr Expansion Vessel is compatible with:

• ? Grant Vortex Combi 36kW (Internal model)

Need help checking if this part fits your boiler? Contact us with your serial number or GC number—we’re happy to assist.

When to Replace the Expansion Vessel

Replace the MPCBS70 if:

• You experience frequent pressure drops or overpressure in your boiler system

• The pressure relief valve (PRV) is discharging water frequently

• The vessel feels heavy and waterlogged, indicating diaphragm failure

• There is visible corrosion or leaks from the valve or tank

• You're conducting a major service or component upgrade

Ignoring expansion vessel faults can lead to leaks, PRV discharge, and premature wear of system components.

 Technical Specifications

• Part Number: MPCBS70

• Manufacturer: Grant UK

• Type: Expansion vessel for sealed heating system

• Application: Grant Vortex Combi 36kW oil boiler

• Capacity: 14 litres

• Pre-Charge Pressure: Factory-set (typically 0.8 – 1.0 bar)

• Material: Steel outer with synthetic rubber diaphragm

• Mounting: Internal to boiler casing (check boiler manual for fitting location)