Worcester Bosch
Worcester Bosch Pump UPM4L 15-75 8737605871
Worcester Bosch UPM4L 15-75 circulating pump, part 8737605871, for Greenstar 8000+ Style and Greenstar Gr8701IW boilers.
At a glance
- Also known as 1200078
£333.31
£277.76 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 UPM4L 15-75 is a Worcester Bosch circulating pump, supplied under part number 8737605871. It moves heating water around the primary circuit of Greenstar 8000+ Style and Greenstar Gr8701IW combi and system boilers. The pump is the component that maintains flow through the boiler, radiators and hot water circuit.
Signs this part needs replacing
- Boiler locks out or shows a pump-related fault code during a heating or hot water demand
- Radiators warm unevenly or stay cold while the boiler fires and reaches temperature
- Pump body noisy in operation, with grinding, humming or rumbling audible at the casing
- No differential temperature across flow and return, or flow proving switch not satisfied
- Pump head hot to touch or signs of leakage, weeping or staining around the pump housing
Before you order
- Confirm the boiler model and GC number against the fits list before ordering
- Check the existing pump label to verify a UPM4L 15-75 is currently fitted
- Ensure the system is isolated, drained and electrically isolated before removal
- Check the boiler's fault history to confirm the pump is the cause rather than a control or sensor fault
Compliance
| Alternative numbers | 1200078 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 32 C NG | 47-800-44 | 47-800-44 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 32 CB NG | 47-800-49 | 47-800-49 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 36 C NG | 47-800-45 | 47-800-45 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 36 CB NG | 47-800-50 | 47-800-50 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 40 C NG | 47-800-46 | 47-800-46 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 45 C NG | 47-800-47 | 47-800-47 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE COMBI GR8701iW 50 C NG | 47-800-48 | 47-800-48 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE SYSTEM GR8701iW 30 S NG | 41-800-27 | 41-800-27 | — | — |
| WORCESTER GREENSTAR 8000+ STYLE SYSTEM GR8701iW 35 S NG | 41-800-28 | 41-800-28 | — | — |
| WORCESTER GREENSTAR GR8701iW 30 S NG | — | — | — |
Showing 10 of 18 compatible appliances.
Documents & drawings
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