Baxi
Baxi Circulation Pump 7811852
Baxi circulation pump, part number 7811852, for Aquaheat Hi/HWI appliances.
At a glance
- Appliance family: Aquaheat Hi/HWI
- Also known as 1129398
£442.92
£369.10 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 7811852 is a circulation pump used in Baxi Aquaheat Hi/HWI appliances. It moves primary water around the heating circuit, maintaining flow through the boiler and the system. The pump is a serviceable component and is replaced as a complete unit.
Signs this part needs replacing
- The pump runs noisily, with grinding, humming or rattling that does not clear after venting
- The pump body is hot but the pipework either side stays cold, indicating no circulation
- The boiler fires but the heating circuit does not warm up, or radiators stay cold
- The pump does not run at all when the appliance calls for heat
- Repeated overheat or flow-related lockouts on the appliance
Before you order
- Confirm the appliance model against the fit list above before ordering
- Check the part number on the existing pump matches 7811852
- Check the pump body, valves and connections for damage or leaks before fitting
- Isolate the electrical supply and the water circuit before removing the old pump
Compliance
| Alternative numbers | 1129398 |
|---|
| 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.
No technical questions yet for this part.
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