Worcester 87161064420 Return Unit – Genuine Replacement for Greenstar CDI, CDI Classic, Junior HE & Si Boilers

Description

Worcester 87161064420 Return Unit – Genuine Replacement for Greenstar CDI, CDI Classic, Junior HE & Si Boilers

The Worcester 87161064420 Return Unit is a genuine manufacturer replacement component designed to maintain optimal water circulation in your Worcester Greenstar boiler. This return manifold assembly ensures that system water returns to the heat exchanger efficiently, preserving the boiler’s heating performance and extending its lifespan.

Ideal for both installers and homeowners, this replacement part is compatible with a wide range of Worcester Greenstar boilers, including Combi, System, and Classic models.

• Compatible Worcester Greenstar Boilers and GC Numbers:

  Greenstar CDI System Range:

  • 30 CDI System – GC No. 41-311-93

  Greenstar CDI Combi Boilers:

  • 25 CDI – GC No. 47-311-92

  • 27 CDI HE – GC No. 47-406-12

  • 27 CDI HE LPG – GC No. 47-406-13

  • 30 CDI – GC No. 47-311-93

  • 30 CDI HE – GC No. 47-406-14

  • 30 CDI HE LPG – GC No. 47-406-15

  • 35 CDI – GC No. 47-311-94

  • 37 CDI HE – GC No. 47-406-08

  • 37 CDI HE LPG – GC No. 47-406-09

  • 40 CDI – GC No. 47-311-95

  Greenstar CDI Classic Range:

  • 29 CDI Classic – GC No. 47-406-34 (7738100216)

  • 29 CDI Classic LPG – GC No. 47-406-35

  • 34 CDI Classic – GC No. 47-406-36

  • 34 CDI Classic LPG – GC No. 47-406-37

  • 38 CDI Classic – GC No. 47-406-38

  • 38 CDI Classic LPG – GC No. 47-406-39

  • 42 CDI HE (Classic) – GC No. 47-406-10

  • 42 CDI HE (Classic) LPG – GC No. 47-406-11

  Greenstar CDI Classic ErP Range:

  • 29 CDI Classic ERP – GC No. 47-406-65 (7738100248)

  • 29 CDI Classic ERP LPG – GC No. 47-406-66

  • 34 CDI Classic ERP – GC No. 47-406-67 (7738100250)

  • 34 CDI Classic ERP LPG – GC No. 47-406-68

  • 38 CDI Classic ERP – GC No. 47-406-69 (7738100252)

  • 38 CDI Classic ERP LPG – GC No. 47-406-70

  • 42 CDI Classic ERP – GC No. 47-406-71 (7738100246)

  • 42 CDI Classic ERP LPG – GC No. 47-406-72

  Greenstar Classic System ErP Boilers:

  • 30 CDI Classic System ErP – GC No. 41-406-37 (7738100244)

  • 30 CDI Classic System ErP LPG – GC No. 41-406-38 (7738100233)

  • 35 CDI Classic System ErP – GC No. 41-406-39 (7738100236)

  • 35 CDI Classic System ErP LPG – GC No. 41-406-40 (7738100237)

  Greenstar i System Boilers:

  • 12i System – GC No. 41-311-67

  • 12i System LPG – GC No. 41-311-69

  • 15i System – GC No. 41-311-84

  • 15i System LPG – GC No. 41-311-85

  • 18i System – GC No. 41-311-86

  • 18i System LPG – GC No. 41-311-87

  • 24i System – GC No. 41-311-68

  • 24i System LPG – GC No. 41-311-70

  Greenstar Junior HE Range:

  • 24i Junior HE – GC No. 47-311-86

  • 24i Junior HE LPG – GC No. 47-311-90

  • 24i Junior HE Mk5 2013 NG/LPG – GC No. 47-406-54

  • 28i Junior HE – GC No. 47-311-87

  • 28i Junior HE LPG – GC No. 47-311-91

  • 28i Junior HE Mk5 2013 NG/LPG – GC No. 47-406-56

  Greenstar Si Boilers:

  • 25Si – GC No. 47-311-84

  • 25Si LPG – GC No. 47-311-88

  • 30Si – GC No. 47-311-85

  • 30Si LPG – GC No. 47-311-89

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FAQs

1. What does the Worcester Bosch return manifold unit 87161064420 do?

The return manifold unit helps balance water return within the boiler system, ensuring even pressure and consistent heating performance across your Worcester Greenstar boiler.

2. Which Worcester boilers is this part compatible with?

“Worcester 87161064420 Return Unit,” “Worcester Greenstar Return Unit replacement,” “Worcester CDI Return Unit spare,” “Worcester boiler return manifold,” “Worcester Greenstar Classic ErP return assembly,” “Worcester Junior HE return manifold replacement.”

3. Is it difficult to install the return manifold unit?

The unit is designed for straightforward installation, but it should always be installed by a Gas Safe registered engineer to ensure safety and maintain warranty compliance.

4. Will this part improve my boiler’s efficiency?

Yes. By stabilizing water return and maintaining consistent pressure, the return manifold unit improves heat distribution and overall boiler efficiency.

5. Does this Worcester Bosch return manifold unit come with a warranty?

Yes. This replacement part comes with a 12-month warranty, providing coverage against manufacturing defects and ensuring reliability.