How do I know if this filling valve is for my boiler?

Verify the reference 05723000 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Saunier Duval piece.

The filling valve allows the heating circuit to be refilled with water.

Does it not fill, leak, or not close properly?

Seized valve, leaking or not sealing.

Which models is it suitable for?

Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.

Installation and recommendations

Check seals and the connection to the circuit.

What does refurbished mean and what coverage does it have?

Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

RefurbishedSaunier Duval Filling valves

Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000

Name: Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000
Brand: Saunier Duval
SKU: LLMIF28E1
Price: 15 EUR
Availability: OutOfStock

15 €VAT included

Filling valve: reconditioned spare part that allows refilling the heating circuit with water. Useful if it doesn't fill, drips, or doesn't close properly. Compatible with Isofast C 28 E, Isofast C 28 E Nox, Isofast C 28 E1 (ref. 05723000). Includes a one-year warranty and delivery within 2–4 working days in the EU.

Consult via WhatsApp

Not sure if it's your part? Send us a photo of the screen printing via WhatsApp and we'll confirm compatibility before you purchase.

Delivery in 2–4 working days

1-year warranty

14-day return

Technical support

Key Data

Reference: 05723000
Brand: Saunier Duval
Type of part: Filling valves
Available units: 0 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 05723000) equips these models. Verified compatibility; check the reference before purchasing.

Saunier Duval

Isofast C 28 E
Isofast C 28 E NOx
Isofast C 28 E1
Isofast C 28 E1 NOx
Isofast C 35 E
Isofast C 35 E1
Isofast F 28 E
Isofast F 28 E1
Isofast F 35 E
Isofast F 35 E1
Isomax C 28 E
Isomax C 28 E2
Isomax F 28 E
Isomax F 28 E2
Isotwin C 24 EA
Isotwin C 28 EA
Isotwin C24E
Isotwin F 24 E
Isotwin F 24 EA
Isotwin F 28 EA

How do I know if this filling valve is for my boiler?: Verify the reference 05723000 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part. It is a Saunier Duval piece.
What is it used for?: The filling valve allows the heating circuit to be refilled with water.
Does it not fill, leak, or not close properly?: Seized valve, leaking or not sealing.
Which models is it suitable for?: Part shared by various models (see Compatibility). If your model does not appear, send us a photo of the marking and we will confirm it.
Installation and recommendations: Check seals and the connection to the circuit.
What does refurbished mean and what coverage does it have?: Part removed from a boiler out of service, inspected and tested. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Filling Key Saunier Duval Isofast F 28 E1 Ref. 05723000

Key Data

Saunier Duval

Spare Parts Related Boiler Isofast F 28 E1