How do I know if this pressure gauge / thermometer is the one for my boiler?

Verify the reference 05704400 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.

The manometer/thermomanometer displays the pressure (and sometimes the temperature) of the circuit.

Is the needle not moving or indicating incorrectly?

Incorrect reading or needle stuck; check for air in the intake.

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 the thread/connection and bleed the pressure point.

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 Pressure gauges - Aquastats

Saunier Duval Thelia 23 Bulb Aquastat Ref. 05704400

Name: Saunier Duval Thelia 23 Bulb Aquastat Ref. 05704400
Brand: Saunier Duval
SKU: ABCT23
Price: 15 EUR
Availability: InStock

15 €VAT includedIn stock · 5 units

Manometer: refurbished spare part that displays the pressure of the boiler circuit. Useful if the needle does not move or shows incorrect pressure. Compatible with Thelia 23, Thelia 23 E, Thelia AS 23 (ref. 05704400). 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: 05704400
Brand: Saunier Duval
Type of part: Pressure gauges - Aquastats
Available units: 5 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 05704400) equips these models. Verified compatibility; check the reference before purchasing.

Thelia

Thelia 23
Thelia 23 E
Thelia AS 23

Themis

Themis 19
Themis 19 V
Themis 23
Themis 23 E
Themis 23 V
Themis 23 EV
Themis AS 23
Themis AS 23 V
Themis A 23 V

How do I know if this pressure gauge / thermometer is the one for my boiler?: Verify the reference 05704400 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.
What is it used for?: The manometer/thermomanometer displays the pressure (and sometimes the temperature) of the circuit.
Is the needle not moving or indicating incorrectly?: Incorrect reading or needle stuck; check for air in the intake.
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 the thread/connection and bleed the pressure point.
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.

Saunier Duval Thelia 23 Bulb Aquastat Ref. 05704400

Key Data

Thelia

Themis

Spare Parts Related Boiler Thelia 23