How to Replace a Worcester Bosch Greenstar 30i Pump (UK)
Fit a new pump on the Worcester Bosch Greenstar 30i. UK part number, isolation and torque steps.
Worcester Bosch
Part number
The Worcester Bosch Greenstar 30i uses the Grundfos UPM3 pump. Check the GC serial number sticker inside the case — Worcester Bosch revised the pump at least once during production.
Isolate
Turn off the gas at the isolation cock. Switch off 230 V at the fused spur. Drain to just below the pump: on the Worcester Bosch Greenstar 30i, the drain-off is on the return pipe.
Fit
Unclip the pump. Transfer the O-rings if OEM includes new ones — always fit the new seals supplied. Torque any brass unions to 25 Nm. Refill to 1.2 bar, bleed and fire for a wet check.
Frequently asked questions
- OEM or compatible?
- For gas-carrying components on the Worcester Bosch Greenstar 30i always fit OEM. Non-gas parts (fans, PCBs, pumps) — OEM keeps the warranty valid.
- Do I need to re-commission?
- Yes — record combustion CO/CO₂ ratio after any gas-side work per BS 6798.
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