Description

Vaillant 0020211945 Flow Sensor – Fits EcoFit Pure, Sustain & Home Combi Boilers

The Vaillant flow sensor 0020211945 helps your boiler detect water movement accurately, so it can support reliable heating and hot water performance. However, when the sensor fails, the boiler may struggle to respond correctly to demand. Therefore, replacing it with the correct new part helps restore accurate flow detection, improves system response, and supports smooth day-to-day boiler operation.

Compatible Boilers

Ecofit Pure Combi Series

• 825 Combi VUW 256/6-3 (H-GB) – GC No. 47-044-68
• 830 Combi VUW 306/6-3 (H-GB) – GC No. 47-044-74
• 835 Combi VUW 356/6-3 (H-GB) – GC No. 47-044-70

Sustain Combi Series

• 825 VUW 256/6-3 (H-GB) – GC No. 47-044-71
• 830 VUW 306/6-3 (H-GB) – GC No. 47-044-72
• 835 VUW 356/6-3 (H-GB) – GC No. 47-044-73
• 24 VUW 246/7-2 – GC No. 47-044-79
• 28 VUW 286/7-2 – GC No. 47-044-80
• 34 VUW 346/7-2 – GC No. 47-044-81

Home Combi Series

• 25-A – GC No. 47-044-62
• 30-A – GC No. 47-044-63
• 35-A – GC No. 47-044-64

Why Choose This Product?

This brand new Vaillant flow sensor offers a simple way to restore accurate water flow detection and dependable boiler response. In addition, it fits selected Vaillant combi models directly, so it helps make replacement easier when you confirm compatibility first.

Delivery and Return

Order before 1 PM for same-day dispatch with standard and next-day delivery options available. Returns are accepted within 30 days if the part is unused and in its original packaging. Always use a Gas Safe registered engineer for installation.

Frequently Asked Questions

1. What does this flow sensor do?
The flow sensor monitors water movement inside the boiler, so the appliance can respond correctly during heating and hot water demand. If it becomes faulty, the boiler may not detect flow properly, which can affect normal performance.

2. Is this sensor compatible with Vaillant Sustain boilers?
Yes, this part fits selected Vaillant Sustain models listed in the compatibility section above. You should still match the part number and boiler model before ordering to avoid ordering the wrong part.

3. Does this part fit Vaillant Ecofit Pure combi boilers?
Yes, it is compatible with selected Ecofit Pure 825, 830, and 835 combi models. Checking the GC number and part number first is the best way to confirm fit.

4. Is this a brand new part?
Yes, this listing is for a brand new Vaillant flow sensor. Therefore, it is suitable if you want a fresh replacement component for your boiler repair.

5. Who should install this part?
A Gas Safe registered engineer should install the sensor to ensure safe and correct fitting. Professional installation also helps protect boiler performance and reduce the risk of fitting issues.