Andrews
Andrews Fastflo WH42/WH56 heat exchanger E780
Heat exchanger for the Andrews Fastflo WH42 NG and WH56 NG water heaters.
At a glance
- Also known as 1821475
- Have the replacement fitted by a Gas Safe registered engineer
Showing prices
£822.12
£685.10 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 E780 is the heat exchanger fitted to Andrews' Fastflo WH42 NG and WH56 NG gas water heaters. It transfers heat from the burner into the water held in the appliance.
Signs this part needs replacing
- Water leaking from around the heat exchanger
- Reduced or fluctuating hot water temperature
- Kettling or banging noises when the appliance 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
| Barcode / EAN | 5039192578009 |
|---|---|
| Alternative numbers | 1821475 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ANDREWS WATER HEATERS ANDREWS HOT WATER SPARES | — | — | — | |
| ANDREWS WATER HEATERS FASTFLO LWH42 | — | — | — | |
| ANDREWS WATER HEATERS FASTFLO LWH56 | — | — | — | |
| ANDREWS WATER HEATERS FASTFLO WH42 | — | — | — | |
| ANDREWS WATER HEATERS FASTFLO WH56 | — | — | — |
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.