Worcester Bosch
Worcester Bosch Heating Block 30kW 8737604654
30 kW heating block for Worcester Bosch Greenstar 2000 Combi and Gr2301IW combi boilers.
At a glance
- Appliance family: Greenstar 2000 Combi and Gr2301IW combi boilers
- Also known as 1038519
£404.05
£336.71 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 heating block is the primary heat exchanger assembly used in Worcester Bosch Greenstar combi boilers, rated at 30 kW. It transfers heat from the combustion circuit into the sealed heating and domestic hot water water circuit. This listing is for the 30 kW variant, manufacturer part number 8737604654.
Signs this part needs replacing
- Water weeping or visible staining around the heating block body or its connections
- Kettling, banging or rumbling noises from the boiler during heat-up
- Reduced heating or hot water performance that does not respond to normal servicing
- Repeated pressure loss on the sealed system with no external leak found
- Scale or corrosion debris restricting flow through the block
Before you order
- Confirm the boiler model and GC number against the fit list before ordering
- Check the boiler's kW rating matches the 30 kW heating block
- Inspect the existing block and sealing points so any associated seals and gaskets can be replaced at the same time
- Confirm whether the appliance is LPG or NG, as the fit list covers both variants
Compliance
| Alternative numbers | 1038519 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 25 C LPG | 47-800-35 | 47-800-35 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 25 C NG | 47-800-34 | 47-800-34 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 30 C LPG | 47-800-37 | 47-800-37 | — | — |
| WORCESTER GREENSTAR 2000 COMBI GR2301iW 30 C NG | 47-800-36 | 47-800-36 | — | — |
| WORCESTER GREENSTAR GR2301iW 25 C LPG COMBI | — | — | — | |
| WORCESTER GREENSTAR GR2301iW 25 C NG COMBI | — | — | — | |
| WORCESTER GREENSTAR GR2301iW 30 C LPG COMBI | — | — | — | |
| WORCESTER GREENSTAR GR2301iW 30 C NG COMBI | — | — | — |
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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