Baxi
Baxi Expansion Vessel 7808833
Expansion vessel for Baxi Assure HP50 and HP40 heat pumps, part number 7808833.
At a glance
- Appliance family: Assure HP50 and HP40 series
- Also known as 1135193
£262.82
£219.02 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 Baxi 7808833 is an expansion vessel used in Baxi Assure HP50 and HP40 heat pump appliances. It accommodates the change in water volume as the system heats and cools, keeping system pressure within its working range. This is a manufacturer part for these appliance families.
Signs this part needs replacing
- System pressure drops repeatedly and needs frequent topping up
- Pressure climbs sharply once the appliance runs and the relief valve discharges
- Water or moisture appears at the vessel air valve when the core is depressed
- The vessel feels heavy or sounds full of water when tapped, with no air charge present
- The pressure gauge swings widely between cold and hot states
Before you order
- Confirm the appliance model on the data plate matches one of the fit lines above
- Check the part number on the existing vessel against 7808833
- Confirm the vessel is accessible and that the system can be isolated and drained before removal
- Establish that the pressure fault lies with the vessel rather than the filling loop or relief valve
Compliance
| Alternative numbers | 1135193 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| BAXI ASSURE HP50-11-1PHMB | — | — | — | |
| BAXI ASSURE HP50-11-3PHMB | — | — | — | |
| BAXI ASSURE HP50-13-1PHMB | — | — | — | |
| BAXI ASSURE HP50-13-3PHMB | — | — | — | |
| BAXI HP40-11-1PHMB | — | — | — | |
| BAXI HP40-11-3PHMB | — | — | — | |
| BAXI HP40-13-1PHMB | — | — | — | |
| BAXI HP40-13-3PHMB | — | — | — |
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.
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