Expansion Vessel for Boiler Ref. 05168400 - Thelia, Thema, and Themis
The expansion vessel of the boiler Ref. 05168400 from Saunier Duval absorbs the increase in water volume when heated. If it fails, you will notice sharp fluctuations in pressure, which may cause the safety valve to leak. This component is compatible with boilers from the Thelia, Thema, and Themis ranges, including models such as Thelia 23, Thema C 23 E, and Themis AS 23, among others. It is recommended to replace it when experiencing pressure issues or leaks in the safety valve.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05168400
Expansion vessel with reference 05168400. 14 verified compatibilities: Thelia 23 and Thelia 23 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Thelia 23 | Saunier Duval | Contrasted |
| Saunier Duval Thelia 23 E | Saunier Duval | Contrasted |
| Saunier Duval Thelia AS 23 | Saunier Duval | Contrasted |
| Saunier Duval Thelia 14/23 | Saunier Duval | Contrasted |
| Saunier Duval Thelia 623 | Saunier Duval | Contrasted |
| Saunier Duval Thelia 623 E | Saunier Duval | Contrasted |
| Saunier Duval Thema C 23 E | Saunier Duval | Contrasted |
| Saunier Duval Thema F 23 E | Saunier Duval | Contrasted |
| Saunier Duval Thema C AS 23 E | Saunier Duval | Contrasted |
| Saunier Duval Thema F AS 23 E | Saunier Duval | Contrasted |
| Saunier Duval Themis 23 | Saunier Duval | Contrasted |
| Saunier Duval Themis AS 23 | Saunier Duval | Contrasted |
| Saunier Duval Themis AS 14 | Saunier Duval | Contrasted |
| Saunier Duval Combitek C 23 | Saunier Duval | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if the reference 05168400 is the part for your boiler
What determines it is not the boiler model, but the reference printed on the part you already have installed.
- Find the reference printed on the installed part and check whether it matches the catalogue reference 05168400. If it is not visible, do not identify the part from its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms and faults that the expansion vessel 05168400 resolves
The expansion vessel absorbs the expansion of water when heated. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The boiler pressure frequently drops, and the circuit needs to be refilled often.
Cause: The expansion vessel does not adequately compensate for the variations in water volume, which causes the system to use the filling valve more frequently.
Before changing the expansion vessel, check the radiators, bleed valves, and safety group for visible leaks.
- 02
When lifting the glass, it feels heavy and does not sound hollow when tapped.
Cause: This indicates that the membrane is broken and the expansion vessel has filled with water instead of containing air.
Gently tap the glass on the top and bottom; if the sound is equally solid throughout the body, it is flooded.
- 03
The boiler shows a pressure warning and locks out, even though the pressure gauge is fine when cold.
Cause: An unbalanced vessel causes sharp pressure fluctuations when heating, which leads the control unit to cut off operation for safety reasons.
Compare the cold pressure displayed right when starting the heating; if there is a significant jump in a few minutes, suspect the expansion vessel.
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Expansion vessel data sheet Saunier Duval 05168400
- Catalogue reference
- 05168400
- Brand
- Saunier Duval
- Type of part
- Expansion vessels
- Units in stock
- 4 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- 1-2 business days
- Return
- 14 days
Frequently asked questions about the expansion vessel 05168400
Does this vessel also work for a Thema F 23 E boiler?
Is this glass suitable for a Themis AS14 boiler?
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