Ariston
Ariston Expansion Vessel 65104261
8-litre expansion vessel for Ariston Clas, Clas HE and E Combi gas boilers, part number 65104261.
At a glance
- Also known as 1595321, N6779-1
Showing prices
£105.59
£87.99 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 Ariston 65104261 is an 8-litre expansion vessel for Ariston gas boilers. It is used in the Clas, Clas HE and E Combi appliance families to manage pressure changes within a sealed heating system. The vessel provides expansion capacity as system water heats and cools.
Signs this part needs replacing
- Boiler pressure rises sharply when the heating is running.
- Pressure relief valve discharges water during heating cycles.
- System pressure reads high when hot and returns to normal when cold.
- Frequent topping up is required to maintain normal pressure.
- Visible corrosion, water, or air loss at the expansion vessel connection.
Before you order
- Confirm the part number is 65104261.
- Check the boiler model and GC number against the fitment list.
- Verify the existing expansion vessel is 8 litre.
- If unsure, consult the manufacturer's parts list for the appliance.
Compliance
| Alternative numbers | 1595321, N6779-1 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| ARISTON ALTEAS ONE NET 24 | — | — | — | |
| ARISTON ALTEAS ONE NET 30 | 33-014-49 | 33-014-49 | — | — |
| ARISTON ALTEAS ONE NET 35 | 33-014-50 | 33-014-50 | — | — |
| ARISTON ARISTON CLAS 21 FF SYSTEM | — | — | — | |
| ARISTON ARISTON CLAS 24 FF | — | — | — | |
| ARISTON ARISTON CLAS 28 FF | — | — | — | |
| ARISTON ARISTON CLAS 28 FF SYSTEM | — | — | — | |
| ARISTON ARISTON CLAS 32 FF SYSTEM | — | — | — | |
| ARISTON ARISTON CLAS HE 12R | — | — | — | |
| ARISTON ARISTON CLAS HE 18 FF SYSTEM | — | — | — |
Showing 10 of 123 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
ARISTON appliance manual — CLAS 21 FF SYSTEM NG (IE) EDITION 3 (MAR 2008) (GC 41-116-27), CLAS 24 FF NG (IE) EDITION 3 (MAR 2008) (GC 47-116-59), CLAS 28 FF NG (IE) EDITION 3 (MAR 2008) (GC 47-116-61), CLAS 28 FF SYSTEM NG (IE) EDITION 3 (MAR 2008) (GC 41-116-28), CLAS HE 24 FF NG UK (MAY 2007) (GC 47-116-51), CLAS HE 30 FF NG UK (MAY 2007) (GC 47-116-52), CLAS HE 38 FF NG UK (MAY 2007) (GC 47-116-53)
manualmanualARISTON appliance manual — CLAS HE 18 FF SYSTEM NG UK (MAY 2007) (GC 41-116-26), CLAS HE 24 FF SYSTEM NG UK (MAY 2007) (GC 41-116-22), CLAS HE 30 FF SYSTEM NG UK (MAY 2007) (GC 41-116-23)
manualmanualARISTON appliance manual — CLAS HE EVO 24 UK (GC 47-116-73), CLAS HE EVO 30 UK (GC 47-116-74), CLAS HE EVO 38 UK (GC 47-116-75), CLAS HE SYSTEM EVO 18 UK (GC 41-116-41), CLAS HE SYSTEM EVO 24 UK (GC 41-116-42), CLAS HE SYSTEM EVO 30 UK (GC 41-116-43)
manualmanualARISTON appliance manual — CLAS HE R 12 NG (GC 41-116-30), CLAS HE R 18 NG (GC 41-116-31), CLAS HE R 24 NG (GC 41-116-32)
manualmanualARISTON appliance manual — CLAS NET ONE 24 UK (GC 47-116-88), CLAS NET ONE 30 UK (GC 47-116-89), CLAS NET ONE 38 UK (GC 47-116-90), CLAS ONE 24 UK (GC 47-116-85), CLAS ONE 30 UK (GC 47-116-86), CLAS ONE 38 UK (GC 47-116-87), CLAS SYSTEM ONE 18 UK (GC 41-116-49), CLAS SYSTEM ONE 24 UK (GC 41-116-50), CLAS SYSTEM ONE 30 UK (GC 41-116-51)
manualmanualARISTON appliance manual — E-COMBI 24 FF NG (UK) (GC 47-116-62), E-COMBI 30 FF NG (UK) (GC 47-116-63), E-COMBI 38 FF NG (UK) (GC 47-116-64), E-SYSTEM 24 NG (UK) (GC 41-116-34), E-SYSTEM 30 NG (UK) (GC 41-116-35)
manualmanualARISTON appliance manual — E-COMBI EVO 24 FF UK (GC 47-116-68), E-COMBI EVO 30 FF UK (GC 47-116-69), E-COMBI EVO 38 FF UK (GC 47-116-70), E-SYSTEM EVO 24 UK (GC 41-116-39), E-SYSTEM EVO 30 UK (GC 41-116-40)
manualmanualARISTON appliance manual — E-COMBI ONE 24 (GC 47-116-83), E-COMBI ONE 30 (GC 47-116-84), E-SYSTEM ONE 24 (GC 41-116-47), E-SYSTEM ONE 30 (GC 41-116-48)
manualmanualARISTON appliance manual — GENUS HE 24 FF NG UK (APRIL 2007) (GC 47-116-54), GENUS HE 30 FF NG UK (MAY 2007) (GC 47-116-55), GENUS HE 38 FF NG UK (MAY 2007) (GC 47-116-56)
manualmanualARISTON appliance manual — GENUS HE 24 FF SYSTEM NG UK (MAY 2007) (GC 41-116-24), GENUS HE 30 FF SYSTEM NG UK (MAY 2007) (GC 41-116-25)
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