Grant Expansion Vessel 8Ltr Vortex Wh Boilers Wbs07

Vortex Eco Wall Hung 16/21 8 Ltr Height 80mm Width 220mm

Grant Expansion Vessel 8Ltr – WBS07

Genuine 8-Litre Expansion Vessel for Grant Vortex Wall-Hung Oil Boilers

The Grant WBS07 Expansion Vessel is a genuine 8-litre internal expansion vessel, specifically designed for use with Grant Vortex wall-hung oil-fired boilers. This vessel is a critical component in sealed system boilers, allowing for the safe expansion of water as it heats and preventing excessive pressure that could lead to leaks or system damage.

Whether you're replacing a faulty vessel or upgrading during routine maintenance, the WBS07 ensures stable boiler pressure, efficient operation, and long-term system safety.

Key Features & Benefits

• Official Grant OEM Part – WBS07
  Designed and approved by Grant for a perfect fit and long-lasting performance.

• 8-Litre Capacity for Sealed Systems
  Accurately sized to meet the pressure demands of wall-hung Grant Vortex boilers.

• Robust Diaphragm Design
  Internal membrane separates air and water to maintain consistent pressure and absorb thermal expansion.

• Reduces Risk of Pressure-Related Faults
  Helps prevent safety valve discharges, leaks, and boiler lockouts caused by overpressure.

• Easy to Install
  Supplied pre-pressurised and ready for installation in compatible boiler models.

• Durable, Corrosion-Resistant Construction
  Designed for longevity in demanding heating environments.

 Compatible Grant Boiler Models

The WBS07 Expansion Vessel is suitable for:

• Grant Vortex Eco Wall-Hung 12–16kW

• Grant Vortex Eco Wall-Hung 16–21kW

• Grant Vortex Wall-Hung Utility Boilers (specific models)

Need help confirming compatibility? Just provide your boiler's model or serial number—we’re happy to check for you.

 When to Replace the Expansion Vessel

Replace the WBS07 if:

• The system is experiencing frequent pressure drops or PRV discharge

• The vessel is waterlogged or the diaphragm is no longer holding charge

• There are signs of rust, corrosion, or visible leaks

• You're installing a new sealed system or completing a full boiler service

A faulty expansion vessel can compromise the entire heating system, causing safety issues and performance drops.

Technical Specifications

• Part Number: WBS07

• Manufacturer: Grant UK

• Vessel Type: Diaphragm expansion vessel

• Capacity: 8 litres

• Pre-Charge Pressure: Typically set at 1.0 bar (check boiler manual)

• Connection Size: ½" BSP (standard)

• Material: Corrosion-resistant steel with internal membrane

• Mounting: Internal to boiler casing (wall-hung design)