
Ucp
Baxi expansion vessel 8L 5114691
An 8-litre pressurised expansion vessel with an integrated pressure relief valve, fitted across Baxi Duo-tec, Platinum Combi, Megaflo System and selected Main and Potterton boilers.
At a glance
- Also known as 2081144
- Have a Gas Safe registered engineer fit and re-pressurise the system
£67.68
£56.40 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The 5114691 is an 8-litre expansion vessel made by Baxi, fitted inside the boiler casing to absorb the increase in water volume as the central heating system heats up. It ships with an integrated pressure relief valve (248056) and carries GC number H289-989.
Signs this part needs replacing
- Boiler pressure gauge creeps up or drops repeatedly between top-ups
- Pressure relief valve drips or discharges water
- Boiler locks out on a pressure fault
- Banging or knocking noises from the pipework as the system heats up
Before you order
- Match part number 5114691 printed on the existing vessel before ordering
- Isolate and depressurise the system before removal
- Have a Gas Safe registered engineer fit and re-pressurise the system
Compliance
| Alternative numbers | 2081144 |
|---|
No fitment data held for this part.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
No documents held for this part. The technical team will source them from the manufacturer — usually the same working day.
No technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.
