Ferroli
Ferroli Expansion Vessel 10L 3980H950
10 litre expansion vessel for the Ferroli Bluehelix Hitech RRT 34C, part number 3980H950.
At a glance
- Also known as 3510353
£112.38
£93.65 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 Ferroli 3980H950 is a 10 litre expansion vessel used in the Bluehelix Hitech RRT 34C appliance family. It absorbs the volume increase of system water as it heats, limiting pressure rise within the sealed heating circuit. The vessel is a serviceable component and is replaced when its internal diaphragm or charge is no longer holding.
Signs this part needs replacing
- System pressure climbs sharply once the boiler is running and heating the circuit.
- The pressure relief valve discharges water during normal heating cycles.
- Water or moisture is present at the vessel's air valve when the cap is removed.
- Boiler pressure drops repeatedly and needs frequent topping up.
- Pressure swings widely between cold and hot states on the gauge.
Before you order
- Confirm the appliance model and GC number against the manufacturer's parts list.
- Check the existing vessel's capacity and connection arrangement match the 10 litre unit.
- Verify the vessel's physical dimensions and mounting position allow it to fit the casing.
- Check system charge pressure and the condition of the pressure relief valve before fitting.
Compliance
| Alternative numbers | FER3980H950, 3510353 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| FERROLI BLUEHELIX HITECH RRT 34C | 47-267-76 | 47-267-76 | — | — |
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.
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