Ideal
Ideal Expansion Vessel 8 Litre 113205
Ideal 8 litre expansion vessel, part 113205, for British and Scottish Gas, Classic, Henrad and Optia appliances. GC number 374-100.
At a glance
- Part type: Expansion vessel
- Also known as EXPANSION-VESSEL-8-LTR-SS-KIT, 1175731
Showing prices
£148.50
£123.75 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 Ideal 113205 is an 8 litre expansion vessel used in Ideal British and Scottish Gas, Classic, Henrad and Optia appliances. It is a sealed chamber partly filled with air that absorbs the pressure surges produced as the water in a sealed heating system heats and expands. Without a working vessel, that expansion has nowhere to go and system pressure climbs until the pressure relief valve opens.
Signs this part needs replacing
- Boiler pressure drops repeatedly and the system needs regular topping up.
- Water discharges from the pressure relief valve, often with the gauge reading high.
- The pressure gauge swings widely between cold and hot states.
- Water or corrosion is present at the vessel connection or the air valve.
- The vessel feels heavy or sounds full of water when removed.
Before you order
- Check the GC number on the appliance data badge against the compatibility list below.
- Confirm the appliance model and serial number before ordering.
- Compare the connection and mounting position with the vessel being replaced.
Mechanical
| Part type | 8Ltr S/S Expansion Vessel Kit |
|---|
Compliance
| Manufacturer part number (MPN) | 113205 |
|---|---|
| GC number | 374-100 |
| Barcode / EAN | 5022141132056 |
| Alternative numbers | EXPANSION-VESSEL-8-LTR-SS-KIT, 1175731 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL BRITISH/SCOTTISH GAS 100 RD1 | 41-387-52 | 41-387-52 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 30 RD1 | 41-349-72 | 41-349-72 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 40 RD1 | 41-349-73 | 41-349-73 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 50 RD1 | 41-349-74 | 41-349-74 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 60 RD1 | 41-349-75 | 41-349-75 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 70 RD1 | 41-349-76 | 41-349-76 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 80 RD1 | 41-349-77 | 41-349-77 | — | — |
| IDEAL CLASSIC COMBI FF280 | 47-415-08 | 47-415-08 | — | — |
| IDEAL CLASSIC COMBI NF80 | 47-415-07 | 47-415-07 | — | — |
| IDEAL CLASSIC FF 2 100 | 41-349-71 | 41-349-71 | — | — |
Showing 10 of 233 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
IDEAL appliance manual — BRITISH/SCOTTISH GAS 100 RD1 (GC 41-387-52), BRITISH/SCOTTISH GAS 30 RD1 (GC 41-349-72), BRITISH/SCOTTISH GAS 40 RD1 (GC 41-349-73), BRITISH/SCOTTISH GAS 50 RD1 (GC 41-349-74), BRITISH/SCOTTISH GAS 60 RD1 (GC 41-349-75), BRITISH/SCOTTISH GAS 70 RD1 (GC 41-349-76), BRITISH/SCOTTISH GAS 80 RD1 (GC 41-349-77)
manualmanualIDEAL appliance manual — CLASSIC COMBI FF280 (GC 47-415-08)
manualmanualIDEAL appliance manual — CLASSIC COMBI NF80 (GC 47-415-07)
manualmanualIDEAL appliance manual — CLASSIC FF 2 100 (GC 41-349-71), CLASSIC FF LX 230 (GC 41-387-24), CLASSIC FF LX 240 (GC 41-387-25), CLASSIC FF LX 250 (GC 41-387-26), CLASSIC FF LX 260 (GC 41-387-27), CLASSIC FF LX 270 (GC 41-387-28), CLASSIC FF LX 280 (GC 41-387-29)
manualmanualIDEAL appliance manual — CLASSIC FF 250P (GC 41-387-07), CLASSIC FF 260P (GC 41-387-08), CLASSIC FF 275P (GC 41-387-09), CLASSIC FF LX 250P (GC 41-387-30), CLASSIC FF LX 260P (GC 41-387-31), CLASSIC FF LX 275P (GC 41-387-32)
manualmanualIDEAL appliance manual — CLASSIC FF230 (GC 41-387-02), CLASSIC FF240 (GC 41-387-03), CLASSIC FF250 (GC 41-387-04), CLASSIC FF260 (GC 41-387-05), CLASSIC FF280 (GC 41-387-06), CLASSIC NF LX 230 (GC 41-387-24), CLASSIC NF LX 240 (GC 41-387-25), CLASSIC NF LX 250 (GC 41-387-26), CLASSIC NF LX 260 (GC 41-387-27), CLASSIC NF LX 270 (GC 41-387-28), CLASSIC NF LX 280 (GC 41-387-29), CLASSIC NF230 (GC 41-387-01), CLASSIC NF240 (GC 41-387-02), CLASSIC NF250 (GC 41-387-03), CLASSIC NF260 (GC 41-387-04), CLASSIC NF270 (GC 41-387-05), CLASSIC NF280 (GC 41-387-06)
manualmanualIDEAL appliance manual — CLASSIC FF3100 (GC 41-392-01), CLASSIC FF330 (GC 41-391-54), CLASSIC FF340 (GC 41-391-95), CLASSIC FF350 (GC 41-391-96), CLASSIC FF360 (GC 41-391-97), CLASSIC FF370 (GC 41-391-98), CLASSIC FF380 (GC 41-391-99)
manualmanualIDEAL appliance manual — CLASSIC FF330 SLIMLINE (GC 41-392-02), CLASSIC FF340 SLIMLINE (GC 41-392-03), CLASSIC FF350 SLIMLINE (GC 41-392-04), CLASSIC FF360 SLIMLINE (GC 41-392-05)
manualmanualIDEAL appliance manual — CLASSIC FF340LF (GC 41-392-90), CLASSIC FF350LF (GC 41-392-91), CLASSIC FF360LF (GC 41-392-92)
manualmanualIDEAL appliance manual — CLASSIC FF350 P (GC 41-392-06), CLASSIC FF360 P (GC 41-392-07), CLASSIC FF380 P (GC 41-392-08)
manualmanualIDEAL appliance manual — CLASSIC LX RS230 (GC 41-387-33), CLASSIC LX RS240 (GC 41-387-34), CLASSIC LX RS250 (GC 41-387-35), CLASSIC LX RS260 (GC 41-387-36), CLASSIC RS230 (GC 41-387-10), CLASSIC RS240 (GC 41-387-11), CLASSIC RS245P (GC 41-387-14), CLASSIC RS250 (GC 41-387-12), CLASSIC RS255P (GC 41-387-15), CLASSIC RS260 (GC 41-387-13)
manualmanualIDEAL appliance manual — CLASSIC LX RS245P (GC 41-387-37), CLASSIC LX RS255P (GC 41-387-38)
manualmanualIDEAL appliance manual — CLASSIC NF 30 (GC 41-429-30), CLASSIC NF 40 (GC 41-429-31), CLASSIC NF 50 (GC 41-429-32), CLASSIC NF 60 (GC 41-429-33), CLASSIC NF 70 (GC 41-429-77), CLASSIC NF 80 (GC 41-429-34)
manualmanualIDEAL appliance manual — CLASSIC NFP 50, CLASSIC NFP 60, CLASSIC NFP 80
manualmanualIDEAL appliance manual — CLASSIC RS 30 (GC 41-429-35), CLASSIC RS 40 (GC 41-429-36), CLASSIC RS 50 (GC 41-429-37), CLASSIC RS 60 (GC 41-429-38)
manualmanualIDEAL appliance manual — CLASSIC RS 50P, CLASSIC RS 60P
manualmanualIDEAL appliance manual — CLASSIC RS330 (GC 41-392-09), CLASSIC RS340 (GC 41-392-10), CLASSIC RS350 (GC 41-392-11), CLASSIC RS360 (GC 41-392-12)
manualmanualIDEAL appliance manual — CLASSIC SE 12 FF (GC 41-395-31), CLASSIC SE 12 FF (SILVER) (GC 41-397-64), CLASSIC SE 15 FF (GC 41-395-32), CLASSIC SE 15 FF (SILVER) (GC 41-397-65), CLASSIC SE 18 FF (GC 41-395-33), CLASSIC SE 18 FF (SILVER) (GC 41-397-68), CLASSIC SE 18 FF SLIMLINE (GC 41-395-43), CLASSIC SE 21 FF (GC 41-395-34), CLASSIC SE 21 FF (SILVER) (GC 41-397-69), CLASSIC SE 24 FF (GC 41-395-35), CLASSIC SE 24 FF (SILVER) (GC 41-397-70), CLASSIC SE 30 FF (GC 41-395-36), CLASSIC SE 30 FF (SILVER) (GC 41-397-71), CLASSIC SE 9 FF (GC 41-395-30), CLASSIC SE 9 FF (SILVER) (GC 41-397-63)
manualmanualIDEAL appliance manual — CLASSIC SE 12 FF SLIMLINE (GC 41-395-41), CLASSIC SE 15 FF SLIMLINE (GC 41-395-42), CLASSIC SE 9 FF SLIMLINE (GC 41-395-40)
manualmanualIDEAL appliance manual — CLASSIC SE 12 RS (GC 41-395-45), CLASSIC SE 15 RS (GC 41-395-46), CLASSIC SE 18 RS (GC 41-395-99), CLASSIC SE 9 RS (GC 41-395-44)
manualmanualIDEAL appliance manual — CLASSIC SE 15P FF (GC 41-397-72), CLASSIC SE 18P FF (GC 41-397-73), CLASSIC SE 24P FF (GC 41-397-74)
manualmanualIDEAL appliance manual — CLASSIC SLIMLINE FF230 (GC 41-387-74), CLASSIC SLIMLINE FF240 (GC 41-387-75), CLASSIC SLIMLINE FF250 (GC 41-387-76), CLASSIC SLIMLINE FF260 (GC 41-387-77)
manualmanualIDEAL appliance manual — HENRAD WH FF LX30 (GC 41-349-94), HENRAD WH FF LX40 (GC 41-349-95), HENRAD WH FF LX50 (GC 41-349-96), HENRAD WH FF LX60 (GC 41-349-97), HENRAD WH FF LX70 (GC 41-349-98), HENRAD WH FF LX80 (GC 41-349-99), HENRAD WH FF100 (GC 41-349-93)
manualmanualIDEAL appliance manual — HENRAD WH FF30 (GC 41-349-87), HENRAD WH FF40 (GC 41-349-88), HENRAD WH FF50 (GC 41-349-89), HENRAD WH FF60 (GC 41-349-90), HENRAD WH FF70 (GC 41-349-91), HENRAD WH FF80 (GC 41-349-92)
manualmanualIDEAL appliance manual — OPTIA FF100 (GC 41-392-01), OPTIA FF30 (GC 41-391-54), OPTIA FF40 (GC 41-391-95), OPTIA FF50 (GC 41-391-96), OPTIA FF60 (GC 41-391-97), OPTIA FF70 (GC 41-391-98), OPTIA FF80 (GC 41-391-99)
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