Glow-worm
Glow-worm HXI/SXI/CXI heat exchanger 801621
Heat exchanger shared across the Glow-worm HXI, SXI, CXI and Ultracom range.
At a glance
- Also known as 1333035
- Have the replacement fitted by a Gas Safe registered engineer
Showing prices
£831.28
£692.73 ex. VAT · VAT at 20%
Available to order · 3 working days
Available to order · 3 working days
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The 801621 is a heat exchanger used across a wide range of Glow-worm's HXI, SXI, CXI and Ultracom boilers. It transfers the heat produced by the burner into the water circulating through the appliance.
Signs this part needs replacing
- Water leaking from around the heat exchanger
- Reduced or fluctuating hot water/heating output
- Kettling or banging noises when the boiler fires
- Lockouts linked to overheat or flow sensors
Before you order
- Confirm your exact model against the fits list
- Match the part number printed on your existing heat exchanger
- Isolate gas, electricity and water before removal
- Have the replacement fitted by a Gas Safe registered engineer
Compliance
| GC number | E84-996 |
|---|---|
| Barcode / EAN | 4024074498781 |
| Alternative numbers | 1333035 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| GLOWWORM GLOWWORM GW 12HXI | — | — | — | |
| GLOWWORM GLOWWORM GW 15HXI | — | — | — | |
| GLOWWORM GLOWWORM GW 18HXI | — | — | — | |
| GLOWWORM GLOWWORM GW 18SXI | — | — | — | |
| GLOWWORM GLOWWORM GW 24CXI | — | — | — | |
| GLOWWORM GLOWWORM ULTRACOM 12HXi | — | — | — | |
| GLOWWORM GLOWWORM ULTRACOM 15HXi | — | — | — | |
| GLOWWORM GLOWWORM ULTRACOM 18HXi | — | — | — | |
| GLOWWORM GLOWWORM ULTRACOM 18SXi | — | — | — | |
| GLOWWORM GLOWWORM ULTRACOM 24CX | — | — | — |
Showing 10 of 22 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
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.
manual
GLOWWORM appliance manual — GW 12HXi (GC 41-047-73)
manualmanualGLOWWORM appliance manual — GW 15HXi (GC 41-047-74)
manualmanualGLOWWORM appliance manual — GW 18HXi (GC 41-047-63)
manualmanualGLOWWORM appliance manual — GW 18SXi (GC 41-047-72)
manualmanualGLOWWORM appliance manual — GW 24CXi (GC 47-047-23)
manualmanualGLOWWORM appliance manual — ULTRACOM 12HXi (GC 41-019-01)
manualmanualGLOWWORM appliance manual — ULTRACOM 15HXi (GC 41-019-02)
manualmanualGLOWWORM appliance manual — ULTRACOM 18HXi (GC 41-019-03)
manualmanualGLOWWORM appliance manual — ULTRACOM 18SXi (GC 41-019-07)
manualmanualGLOWWORM appliance manual — ULTRACOM 24CX (GC 47-019-06)
manualmanualGLOWWORM appliance manual — ULTRACOM 24CXi (GC 47-019-01)
manualNo technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.