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Greenstar 4000, 8000 Life or 8000 Style — what each range gives you and the price installers really charge.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any boiler engineer starts on worcester Bosch Boilers.
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Heat exchanger blockage
— system dirt; power flush prevents.
Fault codes EA, E9
— usually ignition or fan issues.
Wi-Fi pairing
— Wave/EasyControl can be temperamental.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Greenstar i 25kWEntry combi
£900–£2.2k
Greenstar CDi 30kWMost popular
£1.4k–£2.8k
Greenstar 8000 StylePremium combi
£2.2k–£3.8k
Greenstar SystemInc. cylinder fit
£1.2k–£2.8k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Worcester Bosch is the UK's most-installed boiler brand by some margin — known for build quality, the Accredited Installer 10-year warranty, and reliable performance. This guide covers the range available in 2026, what to pay, and the warranty implications.
Worcester Bosch Range Overview
- Greenstar i — entry-level combi, 7-year warranty standard.
- Greenstar CDi Classic — mid-range, popular UK choice, 10-year warranty with Accredited Installer.
- Greenstar 8000 Style/Life — premium combi, top of range.
- Greenstar System — system boiler for cylinder-fed.
- Greenstar Heatslave II — oil-fired for off-grid.
Typical Costs
| Model | Supply £ | Installed £ | Notes |
|---|---|---|---|
| Greenstar i 25kW | 900 | 2,200 | Entry combi |
| Greenstar CDi 30kW | 1,400 | 2,800 | Most popular |
| Greenstar 8000 Style | 2,200 | 3,800 | Premium combi |
| Greenstar System | 1,200 | 2,800 | Inc. cylinder fit |
Warranty
- Standard: 7-year on most combis (when installed by Gas Safe).
- Accredited Installer: 10 years on combis, 12 on some premium.
- Excludes: failure due to scale, dirt, frost without antifreeze.
UK Regulations
- Gas Safe install required.
- Building Control notification.
- Boiler Plus compliance.
Common Problems
- Heat exchanger blockage — system dirt; power flush prevents.
- Fault codes EA, E9 — usually ignition or fan issues.
- Wi-Fi pairing — Wave/EasyControl can be temperamental.
Frequently Asked Questions
Are Worcester boilers worth the premium?
Generally yes — strong build, reliable parts supply, best warranties. Worth £200-400 over budget brands.
How long do they last?
15-20 years with annual servicing. Some run 25+.
Accredited Installer or any Gas Safe?
Accredited for the 10-year warranty. Worth searching for one — same install cost.
Greenstar i or CDi?
CDi has stainless heat exchanger, longer warranty. £200-400 premium worth it.
Worcester or Vaillant?
Both excellent. Worcester slightly bigger UK service network. Vaillant slightly higher efficiency.
Hydrogen-ready?
Yes — GR8300i Hydrogen Ready model available since 2023.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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