Description
Worcester Greenstar Combi Water Valve 87170021100
The Worcester Greenstar Combi Water Valve 87170021100 manages water flow and pressure inside your boiler for smooth and reliable operation. This refurbished water valve helps maintain balanced water distribution between heating and hot water functions. Each unit is cleaned, rebuilt, and tested to ensure consistent performance, offering a cost-effective and durable solution for maintaining boiler efficiency.
Compatible Boilers
Worcester Greenstar HE and HE Plus Series
Greenstar 25 HE Combi (GC No. 47-311-73)
Greenstar 30 HE Combi (GC No. 47-311-74)
Greenstar 30 HE Plus (GC No. 47-311-75)
Greenstar HE Plus 28 (GC No. 47-311-56)
Greenstar HE Plus 35 (GC No. 47-311-57)
Worcester Greenstar R Series
R25 HE Combi (GC No. 47-311-77)
R30 HE Combi (GC No. 47-311-78)
R30 HE Plus Combi (GC No. 47-311-79 / 7713231730)
R35 HE Plus Combi (GC No. 47-311-80 / 7713231729)
R40 HE Plus Combi (GC No. 47-311-81 / 7713231722)
Worcester Greenstar FSN and FSP Series
C1-FSN-GB NG Combi (GC No. 47-311-53)
Greenstar CC1 FSN 29kW (GC No. 47-108-05)
Greenstar FSP GB Combi LPG 7713244855 (GC No. 47-311-45 / 7713244855)
Worcester Greenstar RD Series
RD532 (May 2003 Onwards) (GC No. 41-108-13 / 7713231737)
RD532I (May 2003 Onwards) (GC No. 47-108-10 / 7713231724)
RD537I (Jan 2003 Onwards) (GC No. 47-108-11 / 7713231734)
RD542I (May 2003 Onwards) (GC No. 47-108-12 / 7713231723)
Worcester Greenstar ZWBR Series
Greenstar ZWBR 11-25 A31 (GC No. 47-311-45)
If you’re looking for a Worcester Greenstar 28 CDI Compact Diverter Valve Motor 87377046110 or any other different Worcester Diverter Valve, follow the links provided.
Why Choose This Product?
This refurbished Worcester Greenstar Combi Water Valve ensures precise water control and consistent pressure management inside your boiler. It helps prevent issues such as fluctuating hot water temperature or reduced flow. Each unit is refurbished to restore reliable functionality and tested for safe operation. Choosing this replacement part offers an affordable and environmentally friendly option that improves boiler performance and extends lifespan.
Delivery and Return
Orders placed before 1 PM are dispatched on the same working day. You can choose between standard or next-day delivery at checkout for faster service. Returns are accepted within 30 days if the product remains unused and in its original condition. Always use a Gas Safe registered engineer for installation to ensure proper fitting and safety compliance.
Frequently Asked Questions (FAQs)
1. What does the Worcester Greenstar Combi Water Valve do?
The Worcester Greenstar Combi Water Valve regulates the flow and pressure of water within your boiler. It ensures balanced operation between the heating and hot water systems, preventing fluctuations and maintaining consistent performance.
2. Which Worcester boilers are compatible with this water valve?
This part fits a wide range of Worcester Greenstar and RD series boilers, including HE, HE Plus, R, FSN, FSP, and RD models. Compatibility details and GC numbers are listed in the product description for easy reference.
3. Can this refurbished water valve fix low water pressure or inconsistent hot water?
Yes. Replacing a faulty water valve can resolve common issues such as low pressure, irregular hot water flow, or heating interruptions. It helps restore proper water balance throughout the boiler system.
4. Is this Worcester water valve new or refurbished?
This Worcester Greenstar Combi Water Valve is refurbished. Each part is professionally cleaned, rebuilt, and tested to ensure safe and reliable performance comparable to a new component.
5. Do I need a professional to fit this part?
Yes. Always use a Gas Safe registered engineer to install or replace any boiler components. Professional installation ensures safe operation and proper calibration.

















