The Worcester Bosch 87155058250 Membrane is a genuine Worcester Bosch replacement diaphragm for the diverter valve of Greenstar boilers. The diverter valve sends hot water either to the radiators or to the hot taps, and this pressure-sensitive membrane is what makes the valve switch correctly between heating and hot water.
Over time the membrane can split, harden or perish. Common signs include no hot water at the taps, radiators heating up when only hot water is needed, or water leaking from the diverter valve. Replacing the membrane is a low-cost repair that often avoids replacing the whole diverter valve.
Key Features
- Genuine Worcester Bosch part – Part No. 87155058250 (8 715 505 825 0)
- Pressure-sensitive membrane / diaphragm for the diverter valve
- Made from durable, heat-resistant rubber
- Restores correct switching between heating and hot water
- Cost-effective alternative to a full diverter valve replacement
- 1 year manufacturer guarantee
Compatible Boilers
- Worcester Greenstar i 24 and 28
- Worcester Greenstar i System 12, 15, 18 and 24
- Worcester Greenstar Ri 9, 12, 15, 18, 21 and 24
- Worcester Greenstar Si 25 and 30
- Worcester FSN GB 24 and 28
Please check your boiler model or match the part number before ordering. If you are unsure, contact us and we will confirm the right part for you.
Specifications
| Brand | Worcester Bosch |
| Part Number | 87155058250 (8 715 505 825 0) |
| EAN | 4010009700012 |
| Type | Diverter Valve Membrane / Diaphragm |
| Material | Rubber |
| Condition | New – Genuine Worcester Bosch |
| Guarantee | 1 year manufacturer guarantee |
Installation
This part must be fitted by a Gas Safe registered engineer.
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