Vaillant Turbomax Plus 824E Diverter Valve Replacement 252457

This Vaillant turbomax plus 824E diverter valve 252457 controls the changeover between central heating and domestic hot water in compatible boilers. If the valve sticks or wears, you may notice hot water going warm/cold, heating and hot water not switching correctly, radiators warming when a tap runs, or unstable flow/temperature. Replacing with the correct diverter valve restores proper switching and helps reduce repeat faults caused by poor CH/DHW changeover.

Compatibility :

• Ecomax 824/2E: VUW 246/2-C (2001-2007)
• Ecomax 828/2E: VUW 286/2-C (2001-2007)
• Ecomax 835E: VUW 356-C (2002-2008)
• Ecotec 832: VUW 32/4 (2007-2016)
• Ecotec 838: VUW 386/4 (2007-2016)
• Turbomax Plus 824E: VUW 242/5 (2000-2001), VUW 242/2-5 (2001-2002), R1 (2002-2003), R2 (2003-2004), R3 (2004-2008)
• Turbomax Plus 828E: VUW 282/5 (2000-2001), VUW 282/2-5 (2001-2002), R1 (2002-2003), R2 (2003-2004), R3 (2004-2008)
• Turbomax Plus 837E: VUW 362/2-5 (2002-2004), R3 (2004-2008)
• Turbomax Pro 24E: VUW 242/3 (2000-2001), VUW 242/2-3 (2001-2002), R1 (2002-2003), R2 (2003-2004), R3 (2004-2008)
• Turbomax Pro 28E: VUW 282/3 (2000-2001), VUW 282/2-3 (2001-2002), R1 (2002-2003), R2 (2003-2004), R3 (2004-2008)

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQ’s)

1. What is Vaillant 252457?
A diverter (3-way) valve used in selected Vaillant boilers to switch water flow between heating and hot water.

2. What problems can a faulty diverter valve cause?
Hot water temperature fluctuations, heating/hot water not switching properly, radiators warming during hot water use, or unstable flow.

3. Is this the correct diverter valve for Turbomax Plus 824E?
It fits the Turbomax Plus 824E variants listed in the compatibility section—match your exact model/version before ordering.

4. How do I confirm compatibility?
Match the part number 252457 and your boiler model/version (and data badge details).

5. Should it be fitted by an engineer?
Recommended—boiler internal components should be installed and tested by a qualified engineer.