Worcester Bosch
Worcester Bosch Heat Exchanger C/W Sump 8716121449
Heat exchanger with integrated sump for Worcester Bosch Greenstar 4000 combi and system boilers.
At a glance
- Also known as 8922897
£441.10
£367.58 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 HEAT EXCHANGER C/W SUMP is a Worcester Bosch heat exchanger assembly supplied with its condensate sump. It transfers heat from the combustion gases to the heating and domestic hot water circuits, with the sump collecting and directing condensate away from the appliance. It is used across the Greenstar 4000 range in both combi and system formats.
Signs this part needs replacing
- Kettling or knocking noises from the appliance during heating or hot water demand
- Overheat lockouts or repeated high-limit trips during normal operation
- Water or condensate weeping from the heat exchanger body or sump joint
- Reduced domestic hot water output or slower recovery than usual
- Visible corrosion, scale build-up or debris blocking the heat exchanger waterways
Before you order
- Confirm the boiler model and GC number against the fitment list for this part
- Check whether the appliance is a combi or system variant, and whether it is NG or LPG
- Inspect the sump, seals and associated gaskets for condition, as these may also need attention during the repair
- Work on the heat exchanger and gas-carrying components must be carried out by a competent, registered engineer
Compliance
| Alternative numbers | 8922897 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 4000 COMBI GR4700iW 25 C LPG | 47-800-31 | 47-800-31 | — | — |
| WORCESTER GREENSTAR 4000 COMBI GR4700iW 25 C NG | 47-800-30 | 47-800-30 | — | — |
| WORCESTER GREENSTAR 4000 COMBI GR4700iW 30 C LPG | 47-800-33 | 47-800-33 | — | — |
| WORCESTER GREENSTAR 4000 COMBI GR4700iW 30 C NG | 47-800-32 | 47-800-32 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S LPG | 41-800-08 | 41-800-08 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 12 S NG | 41-800-07 | 41-800-07 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S LPG | 41-800-10 | 41-800-10 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 15 S NG | 41-800-09 | 41-800-09 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S LPG | 41-800-12 | 41-800-12 | — | — |
| WORCESTER GREENSTAR 4000 SYSTEM GR4700iW 18 S NG | 41-800-11 | 41-800-11 | — | — |
Showing 10 of 28 compatible appliances.
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.
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