3 Bar Metal Safety Valve Saunier Duval Isofast F 35 EA Ref. 05722800
When you open the tap or start the heating, the Saunier Duval Isofast F 35 EA 3 Bar Metal Safety Valve is responsible for maintaining the proper pressure in the boiler circuit. Its function is to release water if the pressure exceeds 3 bar, preventing damage to the system. If this valve fails, you will notice that it drips continuously or does not discharge when necessary. It is compatible with several boilers from the Isofast range, including others like Isofast C 24 EV and Isofast C 35 E. It is recommended to replace it if you observe these symptoms of leakage or malfunction.
VAT included
Consult via WhatsAppSaunier Duval boilers compatible with reference 05722800
Safety valve with reference 05722800. 22 verified compatibilities: Isofast C 24 EV and Isofast C 28 E.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval Isofast C 24 EV | Isofast | Contrasted |
| Saunier Duval Isofast C 28 E | Isofast | Contrasted |
| Saunier Duval Isofast C 28 E1 | Isofast | Contrasted |
| Saunier Duval Isofast C 35 E | Isofast | Contrasted |
| Saunier Duval Isofast C 35 E1 | Isofast | Contrasted |
| Saunier Duval Isofast F 28 E | Isofast | Contrasted |
| Saunier Duval Isofast F 28 E1 | Isofast | Contrasted |
| Saunier Duval Isofast F 35 E | Isofast | Contrasted |
| Saunier Duval Isofast F 35 E1 | Isofast | Contrasted |
| Saunier Duval Isomax C 28 E | Isomax | Contrasted |
| Saunier Duval Isomax C 28 E2 | Isomax | Contrasted |
| Saunier Duval Isomax C28 E204 | Isomax | Contrasted |
| Saunier Duval Isomax C28 E205 | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E | Isomax | Contrasted |
| Saunier Duval Isomax F 28 E2 | Isomax | Contrasted |
| Saunier Duval Isomax F28 E204 | Isomax | Contrasted |
| Saunier Duval Isomax F28 E205 | Isomax | Contrasted |
| Saunier Duval Isotwin C 24 EA | Isotwin | Contrasted |
| Saunier Duval Isotwin C 28 EA | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 E | Isotwin | Contrasted |
| Saunier Duval Isotwin F 24 EA | Isotwin | Contrasted |
| Saunier Duval Isotwin F 28 EA | Isotwin | 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 part number 05722800 is the one 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 05722800. 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 safety valve 05722800 resolves.
The safety valve releases pressure when the circuit exceeds its setting. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The valve is leaking after bleeding the circuit.
Cause: The closure does not seal properly because something is preventing the shutter from returning to its position.
Bleed several times and wait between each bleed: if it continues to drip, the seat is not sealing.
- 02
The valve is leaking water more often than usual, even without temperature changes.
Cause: A damaged spring or a worn seat causes the valve to open prematurely.
Measure the circuit pressure in cold conditions for a few days: if the valve activates at pressures that were previously normal, it has lost calibration.
- 03
There is a trace of dry scale under the discharge pipe, although it is not dripping now.
Cause: This indicates previous leaks, typical of a seat that fails before dripping continuously.
Check if the limescale trace comes from the gas valve or the connection fitting to avoid replacing the wrong part.
- 04
The brass body has corrosion or greenish stains on the thread.
Cause: The hard water has passed through a joint that no longer seals, leaving marks on the metal.
Dry the area and check after some time: if humidity reappears without having bled, the leak is active.
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.
Data sheet for the Saunier Duval safety valve 05722800
- Catalogue reference
- 05722800
- Brand
- Saunier Duval
- Type of part
- Safety valves
- Units in stock
- 7 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Data read on the part and in the manufacturer's documentation
What we have not been able to verify does not appear here.
- Body
- Brass
- Connection / thread
- 1/2"
- The raised text on the red cover is still unreadable; it may contain setting or manufacturer data that we have not confirmed.
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval Isotwin C 28 EA manual (PDF)Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the safety valve 05722800
What connection does the gas valve of the Saunier Duval Isofast F 35 EA have?
Does this valve work for the Saunier Duval Isofast F 28 E?
Does this valve fit the Isotwin C 24 EA or only the Isotwin F 24 E?
What material is the body of this valve for the Isofast C 35 E made of?
Spare parts related to Saunier Duval Isofast
