Alpha
Alpha primary heat exchanger CD35 1.023674
Genuine Alpha primary heat exchanger for the CD Range 35C Combi boiler.
At a glance
- Also known as 1257757
- Fitting should be carried out by a Gas Safe registered engineer
Showing prices
£606.68
£505.57 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
A genuine Alpha primary heat exchanger, part number 1.023674, for the CD35. It transfers heat from the burner into the water circulating through the boiler.
Signs this part needs replacing
- Reduced heat output or lukewarm radiators/hot water
- Boiler locks out on an overheat or flow fault
- Kettling or banging noises from the boiler
- Visible leaks or scale build-up around the heat exchanger
Before you order
- Confirm your boiler is the Alpha CD35C Combi before ordering
- Isolate the water and electrical supply before removing the old exchanger
- Fitting should be carried out by a Gas Safe registered engineer
Compliance
| Alternative numbers | 1257757 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ALPHA ALPHA CD35C | — | — | — | |
| ALPHA ALPHA CD35C LPG | — | — | — | |
| ALPHA CD35C | 47-532-35 | 47-532-35 | — | — |
| ALPHA CD35C (LPG) | 47-532-36 | 47-532-36 | — | — |
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.