Baxi
Baxi Pressure Relief Valve 7875813
Baxi pressure relief valve, part number 7875813, for Aquaheat Hi and HWI appliances.
At a glance
- Appliance family: Aquaheat Hi / HWI
- Also known as 1129448
£47.46
£39.55 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 7875813 is a pressure relief valve used on Baxi Aquaheat Hi and HWI appliances. It opens to discharge water when system pressure exceeds the set limit, protecting the appliance and associated pipework from over-pressurisation. It is a serviceable component and is replaced as a complete valve assembly.
Signs this part needs replacing
- Water continually weeping or dripping from the discharge pipe with the system at normal pressure
- System pressure failing to hold, or rising and falling without explanation
- The valve failing to reseat after it has lifted, leaving a permanent drip at the outlet
- Scale or debris visible at the valve seat or outlet, preventing a clean seal
- Corrosion or staining around the valve body or its connections
Before you order
- Confirm the appliance model against the fit list above before ordering
- Check the system pressure gauge reading and the condition of the discharge pipework
- Verify the part number 7875813 against the appliance's parts list
- Isolate and depressurise the appliance before removal and fitting
Compliance
| Alternative numbers | 1129448 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| BAXI AQUAHEAT HI/ HWI - 4/50 | — | — | — | |
| BAXI AQUAHEAT HI/HWI - 14/50 | — | — | — |
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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