Boiler guide · 4 min read · Updated October 2026
Worcester Bosch warranty: what each Greenstar range covers
Greenstar warranty terms by range — from the 1000's 5 years to the 8000+'s 12 — and the filter, registration and servicing conditions attached.
The range-by-range terms
From our manufacturer research:
- Greenstar 1000 — 5 years, conditional on a system filter
- Greenstar 2000 — 7 years, conditional on a system filter
- Greenstar 4000 — 7 years, extendable to 10 with conditions
- Greenstar CDi Compact — 7 years, extendable to 10 with conditions
- Greenstar Ri — 7 years, extendable to 10 with conditions
- Greenstar 8000+ — 8 years, extendable to 12 with conditions
The conditions behind the numbers
Worcester Bosch's longer terms depend on a system filter being fitted, registration within the required window, and annual servicing. The 8000+'s 12-year maximum is tied to its scheme conditions. These are guarantees with terms, not blanket promises — the exact cover for any pack is confirmed before you order.
Guarantee vs warranty
Worcester Bosch calls its cover a guarantee, which in their usage means a commitment to repair rather than a limited warranty. Either way, the conditions decide what you actually get — read them, or buy from someone who has.
Common questions
Which Worcester Bosch boiler has the longest warranty?
The Greenstar 8000+ range — 8 years standard, extendable to 12 years when the scheme conditions are met.
Is the Worcester Bosch warranty automatic?
No. Every term beyond the base is conditional on a system filter, timely registration and annual servicing. Our fitted installations include registration as part of the job.
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