Baxi DuoTec Combi 40 Expansion Vessel 8 Litre – Brand New | MPN 5114691

A heating system runs reliably only when pressure stays exactly where it should — and the Baxi DuoTec Combi 40 Expansion Vessel (MPN 5114691) is the component that makes that possible. As water heats up and expands within your sealed central heating circuit, this vessel absorbs the increase in volume, regulating pressure and temperature and preventing the kind of strain that leads to leaks, faults, and reduced efficiency over time.

With an 8-litre capacity, it provides ample room for expansion, keeping your system running smoothly and efficiently across every heating cycle. Designed for straightforward installation, it's compatible with a wide range of Baxi boilers — including the DuoTec, Platinum, and System ranges — making it a versatile and dependable replacement for a variety of models.

The Baxi Duotec Expansion Vessel 8L 5114691 regulates pressure and temperature by absorbing excess water during heating.FULLY REFURBISHED AND COMES WITH 12 MONTHS WARRANTY.

Why Choose This Product?

For a part as essential as your expansion vessel, choosing brand new offers complete peace of mind. This unit comes straight from stock, untouched and ready to install, ensuring full confidence in its condition and performance from the very first heating cycle. It regulates system pressure effectively, reduces the risk of leaks and faults, and supports smooth, consistent operation throughout your boiler's day-to-day use.

Backed by a full 12-month warranty, it's a dependable choice for homeowners and professional installers alike who want genuine, unused quality without compromise.

Product Specifications

• Manufacturer: Baxi
• Part Number: 5114691
• Compatible Models: DuoTec Combi 40 and a wide range of Baxi boilers
• Capacity: 8 Litres
• Condition: Brand New
• Warranty: 12 Months

Compatible Boiler Models

Delivery & Returns

Orders placed before 3:00 PM are dispatched the same working day, with both standard and next working day delivery options available at checkout. Returns accepted within 30 days, provided the item is unused and in its original packaging.

Note: Please confirm that MPN 5114691 matches your existing part before placing your order. Installation must always be carried out by a Gas Safe registered engineer to ensure safety compliance and warranty validity.