Ariston
Ariston Gas Valve 65104254
Gas valve for Ariston CLAS and EGIS gas boilers, SIT Sigma 0.845.020, part number 65104254.
At a glance
- Gas valve replacement must be carried out by a Gas Safe registered engineer
£184.46
£153.72 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Ariston 65104254 is a gas valve built on the SIT Sigma 0.845.020 platform. It regulates the flow of gas to the burner on Ariston CLAS and EGIS gas boilers, controlling ignition supply and modulating gas pressure to match demand. It is a service component intended for fitting by a competent heating engineer.
Signs this part needs replacing
- The boiler fails to ignite, with no gas reaching the burner despite a call for heat
- Flame lights then drops out shortly after ignition, or the boiler cycles on lockout
- Unstable or poorly modulated flame, with erratic burner pressure
- Clicking or humming from the valve body without corresponding gas flow
- Any smell of gas around the valve or its connections
Before you order
- Confirm your boiler model against the fitment list above, including any Edition or revision marking
- Check the valve reference on the existing component reads SIT Sigma 0.845.020
- Confirm whether your appliance is natural gas or LPG, as the variants differ
- Gas valve replacement must be carried out by a Gas Safe registered engineer
No specification data held for this part.
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| 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 AS 24 CF LPG | — | — | — | |
| ARISTON AS 24 CF NG | — | — | — | |
| ARISTON AS 24 FF LPG | — | — | — | |
| ARISTON AS 24 FF NG | — | — | — | |
| ARISTON CLAS 21 FF SYSTEM NG (IE) EDITION 3 (MAR 2008) | 41-116-27 | 41-116-27 | — | — |
Showing 10 of 26 compatible appliances.
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.