Alpha
Alpha primary heat exchanger 1.023638
Genuine Alpha primary heat exchanger for the CD25C boiler.
At a glance
- Part type: primary heat exchanger
- Also known as 1257753
- Have this fitted by a Gas Safe registered engineer
Showing prices
£512.29
£426.91 ex. VAT · VAT at 20%
Available to order · 7 working days
Available to order · 7 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
This is Alpha's primary heat exchanger, fitted to the CD25C boiler. It transfers heat from the burner into the system water that feeds the heating circuit.
Signs this part needs replacing
- Reduced heating output or the boiler struggling to reach temperature
- Kettling or banging noises from the heat exchanger
- Leaking or weeping from the heat exchanger body
- Boiler locking out on an overheat or blocked-flow fault
Before you order
- Match the part number printed on your existing heat exchanger before ordering
- Isolate gas, electrical and water supplies before removal
- Check whether a new gasket set is needed for the fit
- Have this fitted by a Gas Safe registered engineer
Compliance
| Alternative numbers | PRIMARY-HEAT-EXCHANGER-CD25, 1023638, 1257753 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA CD25C | 47-532-31 | 47-532-31 | — | — |
| ALPHA CD25C (LPG) | 47-532-32 | 47-532-32 | — | — |
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.
No 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.