Worcester Bosch Greenstar 30CDi Classic System
The Worcester Bosch Greenstar 30CDi Classic System was a high-output wall-mounted system boiler from the Greenstar CDi Classic range and remains installed in many larger homes today. While it is no longer manufactured, this page explains its specification, who it was designed for and your options for servicing, repairs or replacement.
We continue to service and repair this model regularly across Buckinghamshire, Berkshire, West London and surrounding counties.
Need help with your Greenstar 30CDi Classic System? Contact our Worcester Bosch accredited and Gas Safe engineers.
What is the Greenstar 30CDi Classic System?
The Greenstar 30CDi Classic System is a wall-mounted gas system boiler from Worcester Bosch’s Greenstar CDi Classic range. With a 30kW output, it was designed for larger homes with a high demand for central heating and hot water, working alongside a separate hot water cylinder to deliver consistent hot water to multiple bathrooms.
Unlike the CDi Classic combi boilers, the system version does not heat water directly on demand. Instead, it heats and stores hot water in a cylinder, making it well suited to properties where multiple bathrooms need to run simultaneously or where mains water pressure is insufficient for a combi boiler.
The 30CDi Classic System was the smaller of two system boiler outputs in the CDi Classic range, sitting alongside the 35CDi Classic. Both were replaced by the Greenstar 8000 Life, which builds on the CDi Classic’s performance with improved efficiency and a longer warranty.
> Explore the full Worcester Bosch Greenstar range
Greenstar 30CDi Classic System: Key Specifications
✔ Boiler type: System boiler
✔ Central heating output: 30kW
✔ Efficiency rating: A rated / 92%
✔ Fuel type: Natural gas or LPG
✔ Dimensions: 760mm x 440mm x 360mm
✔ Frost protection: Yes
✔ Solar compatible: Yes, compatible with Greenskies panels
✔ Smart control compatible: Yes, including Bosch EasyControl
✔ Suitable for: Larger homes, 13 to 18 radiators, multiple bathrooms with hot water cylinder
Who is this boiler suitable for?
The 30CDi Classic System was designed for larger homes with a high demand for both central heating and stored hot water. It is best suited to properties with:
- 3 to 5 bedrooms
- 2 or more bathrooms
- 13 to 18 radiators
- An existing or new hot water cylinder (150 to 300 litre capacity recommended)
- No loft cold water tank required
For homes needing even greater output, the 35CDi Classic System offered a higher 35kW output within the same range. If you already have a 30CDi Classic System installed and are unsure whether to service, repair or replace it, our engineers can assess your system and give you honest advice.
Servicing and repairing your Greenstar 30CDi Classic System
Although the 30CDi Classic System is no longer manufactured, it can still be serviced and repaired. Parts remain widely available for this model and our Gas Safe engineers carry out full services and fault diagnosis across Buckinghamshire, Berkshire, West London and surrounding counties.
Regular servicing is important for any boiler, but particularly for older models. An annual service helps to:
- Maintain efficiency and keep running costs down
- Identify worn components before they cause a breakdown
- Keep your boiler operating safely
- Satisfy any remaining warranty or insurance requirements
If your 30CDi Classic System has developed a fault, our engineers carry a wide range of Worcester Bosch parts and aim to resolve most repairs in a single visit.
When to consider replacing your 30CDi Classic System
If your boiler is over 12 to 15 years old or experiencing repeated breakdowns, replacement is often the more cost-effective long-term decision. The 30CDi Classic System has been replaced by the Worcester Bosch Greenstar 8000 Life, which offers meaningful improvements across efficiency, warranty and controls.
The Greenstar 8000 Life 30kW System is the natural modern equivalent for homes currently running a 30CDi Classic System. It delivers better efficiency, a longer warranty and full compatibility with the Bosch EasyControl smart thermostat.
Greenstar 30CDi Classic System vs Greenstar 8000 Life 30kW System
Efficiency: 92% vs up to 94%
Warranty: 2 to 5 years vs up to 12 years
Controls: Basic display vs smart control ready
ErP rating: A rated vs A rated
Status: Discontinued vs current model
> Learn more about the Greenstar 8000 Life
Why choose Heppelthwaite – Red Van Plumbers?
Fewer than 5% of UK installers achieve Worcester Bosch Platinum Accredited status. As Platinum Accredited Installers, we install, service and repair the full Greenstar range, including legacy CDi Classic system boilers, across Buckinghamshire, Berkshire, West London and surrounding counties.
- Platinum Accredited Worcester Bosch Installers
- Family-run business established 1948
- Gas Safe registered engineers
- Free fixed quotations with no hidden costs
- Up to 12-year warranty available on new Greenstar 8000 Life installations
> Request a free quote or call 01628 533 550
FAQs – Worcester Bosch Greenstar 30CDi Classic System
Is the Worcester Bosch Greenstar 30CDi Classic System still available to buy?
No. The 30CDi Classic System is no longer manufactured. The modern equivalent is the Worcester Bosch Greenstar 8000 Life 30kW System boiler, which offers improved efficiency and a significantly longer warranty.
Can the Greenstar 30CDi Classic System still be serviced?
Yes. Parts remain widely available and our Gas Safe engineers service and repair all CDi Classic system models across Buckinghamshire, Berkshire and West London. Annual servicing is recommended to maintain efficiency and safety.
What replaced the Greenstar 30CDi Classic System?
The Greenstar 30CDi Classic System was replaced by the Worcester Bosch Greenstar 8000 Life system boiler range. The 8000 Life offers up to 94% efficiency, smart control compatibility and up to a 12-year warranty when installed by a Platinum Accredited Installer.
What is the difference between the 30CDi Classic System and the 35CDi Classic System?
Both are system boilers from the same CDi Classic range. The 30CDi Classic System delivers 30kW and is suited to homes with 13 to 18 radiators, while the 35CDi Classic System delivers 35kW and is better suited to larger homes with greater heating demand and more radiators to heat.
What size hot water cylinder does the 30CDi Classic System need?
A cylinder capacity of 150 to 300 litres is typically recommended depending on the number of bathrooms and occupants. Your heating engineer can advise on the most suitable cylinder size for your property when assessing your system.
How long should a Greenstar 30CDi Classic System last?
With regular annual servicing, a well-maintained 30CDi Classic System can last between 12 and 15 years. If your boiler is approaching or has exceeded this age, it may be worth considering a boiler replacement to avoid repeated repair costs.
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