Expansion Vessel Saunier Duval Isofast F 28 E1 Ref. 5743300
Saunier Duval presents the Expansion Vessel Isofast F 28 E1, with reference 5743300. This expansion vessel is responsible for absorbing the increase in water volume when heated, thus preventing pressure issues in the system. If it fails, you will notice that the pressure of the boiler fluctuates sharply, and the safety valve may start to leak. It is compatible with several models, including the Isofast F 28 E1, Isofast C 28 E1, and others from the Isofast range. It is recommended to replace it when you observe these symptoms or if the membrane shows visible damage.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 5743300
Expansion vessel with reference 5743300. Five confirmed compatibilities: Isofast F 28 E1 and Isofast C 28 E1.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast F 28 E1 | Saunier Duval | Contrasted |
| Saunier Duval Isofast C 28 E1 | Saunier Duval | Contrasted |
| Saunier Duval Isofast C 28 E1 NOx | Saunier Duval | Contrasted |
| Saunier Duval Isofast F 28 E | Saunier Duval | Contrasted |
| Saunier Duval Isofast C 28 E | 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 ref. 5743300 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 5743300. 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 5743300 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
You need to recharge the pressure in the heating circuit more often than usual.
Cause: There is a nitrogen leak in the vessel, which is gas and does not wet, so the circuit loses pressure without you seeing water.
Check the entire heating installation (bleed valves, radiators, fittings) for moisture; if you don't see any water leaks, the problem may be in the expansion vessel.
- 02
The safety valve leaks water after a period of operation of the heating system.
Cause: If the vessel does not absorb the expansion of the water, the pressure increases and the safety valve activates to protect the circuit.
Measure the cold pressure and compare it with the pressure after 10-15 minutes of operation; a significant and sustained increase indicates that the expansion vessel may be failing.
- 03
You hear banging in the pipes when the heating pump starts or stops.
Cause: Without the vessel to cushion the pressure surge from the pump, that vibration is transmitted through the pipes.
Make sure there is no trapped air in the radiators and that the pump speed is not set to maximum before concluding that it is 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 5743300
- Catalogue reference
- 5743300
- Brand
- Saunier Duval
- Type of part
- Expansion vessels
- Units in stock
- 2 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Frequently asked questions about the expansion vessel 5743300
What fault does replacing this expansion vessel resolve?
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