How do I know if this 3-way valve is for my boiler?

Verify the reference 8738701500 printed and ensure your model is on the list of compatible ones; also compare the connections with the original part.

The 3-way valve diverts the water between the heating circuit and the domestic hot water (DHW) circuit.

Does it provide hot water but not heat the radiators (or vice versa)?

Typical symptom that the valve or its motor is not switching; check the actuator motor and ensure the body is not seized.

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 if you need the motor, the body, or the complete assembly.

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.

RefurbishedJunkers 3-way valves

3-Way Valve Junkers ZW23 1 AE23 S3705 Ref. 8738701500

Name: 3-Way Valve Junkers ZW23 1 AE23 S3705 Ref. 8738701500
Brand: Junkers
SKU: V3CJZW23
Price: 75 EUR
Availability: InStock

75 €VAT includedIn stock · 2 units

3-way valve: refurbished spare part that diverts water between heating and domestic hot water. Useful if it provides hot water but does not heat radiators, or vice versa. Compatible with ZW23-1 AE23, ZW23-1 AE31, ZW23-1 KE23 (ref. 8738701500). 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: 8738701500
Brand: Junkers
Type of part: 3-way valves
Available units: 2 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

The same part (ref. 8738701500) equips these models. Verified compatibility; check the reference before purchasing.

Junkers Euroline ZS-ZW23 / ZW23-1

ZW23-1 AE23
ZW23-1 AE31
ZW23-1 KE23
ZW23-1 KE31

Junkers Novatherm / Novastar ZW20-ZS20

ZW20-1 AME23
ZW20 AME
ZW20 KE
ZW20 KD
ZS20 AME
ZS20 KE

How do I know if this 3-way valve is for my boiler?: Verify the reference 8738701500 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 3-way valve diverts the water between the heating circuit and the domestic hot water (DHW) circuit.
Does it provide hot water but not heat the radiators (or vice versa)?: Typical symptom that the valve or its motor is not switching; check the actuator motor and ensure the body is not seized.
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 if you need the motor, the body, or the complete assembly.
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.

3-Way Valve Junkers ZW23 1 AE23 S3705 Ref. 8738701500

Key Data

Junkers Euroline ZS-ZW23 / ZW23-1

Junkers Novatherm / Novastar ZW20-ZS20

Spare Parts Related Boiler ZW23 1 AE23 S3705