Worcester Bosch Greenstar Boilers
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The Worcester Bosch Greenstar range explained
The Greenstar range sits at the core of Worcester Bosch’s domestic heating offering. Over time, it has developed from earlier CDi and i series boilers into the current 4000 and 8000 ranges.
While older models are no longer manufactured, they are still installed in many homes. As a result, homeowners often search for these models when looking for repairs, servicing or replacements.
The current range focuses on efficiency, control and long-term reliability. However, understanding how older models compare is just as important when deciding what to do next.
If you are exploring installation options, visit our Worcester Bosch boiler installation page.
The current Worcester Bosch Greenstar range
Worcester Bosch currently offers two main Greenstar ranges for domestic properties. Both are available as combi, system and regular boilers.
Greenstar 8000 Life
The Greenstar 8000 Life is the premium Worcester Bosch boiler. It is designed for homes with higher heating demand and multiple bathrooms, and offers strong performance, modern controls and a longer warranty when installed correctly.
Key features include:
- Up to 94% efficiency and ErP A rating
- Outputs from 30kW to 50kW
- Up to 12-year warranty with a Platinum Accredited Installer
- Quieter operation compared to older models
- Compatible with Bosch EasyControl smart heating controls
This range replaces the CDi Classic and is often recommended where performance and long-term value are the priority.
Greenstar 4000
The Greenstar 4000 is Worcester Bosch’s everyday boiler range and a direct replacement for the i and Si models, including the 25i and 30i. It suits small to medium homes and standard hot water demand.
Key features include:
- Up to 94% efficiency and ErP A rating
- Outputs of 25kW and 30kW
- Up to 10-year warranty with Platinum installation
- Compact design suitable for cupboard installation
- Smart control compatibility – Bosch EasyControl
For many homes, the Greenstar 4000 provides a practical and reliable upgrade from an older boiler.
Greenstar 4000 vs 8000: What’s the difference?
Both the Greenstar 4000 and 8000 are modern Worcester Bosch boilers. The Greenstar 4000 is typically suited to small to medium homes with one or two bathrooms, offering a compact and cost-effective option for straightforward installations. In contrast, the Greenstar 8000 Life is designed for larger properties or higher demand, with greater output, stronger hot water performance and longer warranty options.
Which Worcester Greenstar boiler is right for your home?
Choosing the right boiler depends on your property size, hot water demand and existing system. Here is a simple guide to help you identify the right starting point before speaking with our expert boiler installation team.
| Property Type | Recommended Boiler |
| Small flat or apartment | Greenstar 4000 25kW |
| 2–3 bed house, 1 bathroom | Greenstar 4000 30kW |
| 3–4 bed house | Greenstar 8000 Life 30kW or 35kW |
| Larger home, multiple bathrooms | Greenstar 8000 Life 35kW to 50kW |
| Property with hot water cylinder | System boiler |
| Older heating setup | Regular boiler |
These are general guidelines. We carry out a free survey before recommending a specific model.
Choosing the Right Worcester Greenstar Boiler Type
Not sure which Worcester Greenstar boiler is right for your home? This quick guide explains the key differences between each type.
Combi Boilers
Worcester Bosch combi boilers provide heating and hot water directly from a single unit, without the need for tanks or cylinders. They are ideal for smaller to medium-sized homes with one bathroom and limited space.
System Boilers
Worcester Bosch system boilers work with a hot water cylinder to deliver strong, consistent hot water to multiple taps at once. They are well suited to larger homes or properties with more than one bathroom.
Regular Boilers
Worcester Bosch regular boilers are designed for traditional heating systems with a cylinder and cold water tank. They are often the best option for older properties or homes with existing conventional systems.
Greenstar Boiler costs and finance options
The cost of a new Worcester Greenstar boiler depends on the model, your property and any system upgrades required. We provide clear, fixed quotations following a home survey, so you know exactly what to expect.
Flexible finance options are also available to help spread the cost.
Request a free boiler survey
Previous Worcester Bosch Greenstar models
Older Greenstar models are still widely used across the UK. Many homeowners search for these models when arranging servicing or considering a replacement. We service and repair all of the models listed below.
Greenstar CDi Classic
The CDi Classic range was one of Worcester Bosch’s most recognised boiler series – available as high-output combi, system and regular boilers, and a standard choice in homes across the UK for many years. This range has been replaced by the Greenstar 8000 Life.
Models include:
Greenstar 29CDi Classic
Greenstar 34CDi Classic
Greenstar 38CDi Classic
Greenstar 42CDi Classic
Greenstar 30CDi Classic
Greenstar 35CDi Classic
Greenstar CDi Compact
The CDi Compact range was designed for homes where space is limited – small enough to fit inside a standard kitchen cupboard while still delivering strong output. This range has been replaced by the Greenstar 4000.
Models include:
Greenstar 28CDi Compact
Greenstar 32CDi Compact
Greenstar 30Si Compact
Greenstar 25Si Compact
Greenstar i range
The Greenstar i range became one of Worcester Bosch’s most popular series. The i range offered improved efficiency, straightforward controls and reliable everyday performance. Discontinued in 2020–2021, they have been replaced by the Greenstar 4000.
Greenstar 15i
Greenstar 18i
Greenstar 21i
Greenstar 24i Junior
Greenstar 24i
Greenstar 25i
Greenstar 27i
Greenstar 30i
Greenstar 30i Classic
Greenstar Ri range
Servicing, Repairs & when to Replace your older Greenstar boiler
Your Worcester Greenstar boiler is designed to be reliable, but regular maintenance is essential to keep it performing properly. Whether you have a newer model or an older CDi or i range boiler, ongoing servicing and prompt repairs help avoid costly issues and keep your heating running as expected.
Boiler Servicing
Boiler servicing keeps your boiler running efficiently and safely, helps prevent breakdowns and protects your warranty. We service all Worcester Bosch Greenstar boilers, including older CDi Classic, CDi Compact, i range and Ri models.
Boiler Repairs
Older boilers can develop faults over time. Our Gas Safe engineers diagnose issues quickly and carry out reliable repairs using quality parts, helping restore your heating with minimal disruption.
When to consider replacing your boiler
If your boiler is over 12 to 15 years old or breaking down regularly, replacement is often the more cost-effective option. Newer Greenstar models offer better efficiency, longer warranties, improved controls and more consistent performance. We will always give you honest advice and never recommend a replacement unless it genuinely makes financial sense.
Worcester Bosch Accredited Installers
Choosing the right installer is just as important as choosing the right boiler. Platinum Accreditation is Worcester Bosch’s highest level of recognition and fewer than 5% of UK installers achieve it.
As Platinum Accredited Installers, Heppelthwaite – Red Van Plumbers:
- Offer extended warranties of up to 12 years on selected Greenstar models
- Follow Worcester Bosch installation quality standards
- Carry out full system assessments to ensure correct boiler specification
- Register warranties directly with Worcester Bosch after installation
Established in 1948, we have provided trusted heating services across Buckinghamshire, Berkshire and surrounding areas for over 75 years.
FAQs – Worcester Bosch Greenstar Boilers
We offer a complete range of boiler and heating services across Buckinghamshire, Berkshire, West London, Oxfordshire and surrounding counties. Here are some frequently asked questions about Worcester Greenstar Boilers.
What is the Worcester Greenstar range?
What replaced the Greenstar CDi Classic?
What replaced the Worcester Greenstar 30i?
How long do Greenstar boilers last?
Can older Greenstar boilers still be serviced?
What warranty do I get with a new Greenstar boiler?
A Trusted Family-Run Plumbing and Heating Company Since 1948
We are a family run plumbing and heating company established in 1948. Homeowners and businesses across Buckinghamshire, Berkshire and West London choose us for reliable workmanship, honest advice and a professional approach. >Learn more about our company and award winning team.
✔ Family run business established in 1948
✔ Gas Engineers who live and work locally
✔ Clear advice and costs before work begins
✔ Payment only once the job is complete
All contact with Red Van plumbers has been a pleasure everyone I have spoken to were extremely helpful and pleasant and the engineers all did a great job without any mess, thank you very much.
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We have been using the Red Van Plumbers for more years than either of us can remember. Always the same reliable service, prompt attention to detail and most courteous of operatives at a sensible price. Highly recommended yet again.
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Boiler Engineers Near You
We install, service and repair Worcester Greenstar boilers across Buckinghamshire, Berkshire, Oxfordshire and West London, including High Wycombe, Marlow, Beaconsfield, Maidenhead and surrounding areas.
> Find our professional Greenstar installers in your area.
Office | Warehouse: Unit 5, Jacksons Industrial Estate, Wessex Road, Bourne End, Bucks, SL8 5DT
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