Worcester Bosch Greenstar 35CDi Classic
The Worcester Bosch Greenstar 35CDi Classic was one of the most capable system boilers in the Greenstar range and remains installed in many 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 areas.
Need help with your 35CDi Classic? Request a free quote today.
What is the Greenstar 35CDi Classic?
The Greenstar 35CDi Classic is a wall-mounted gas system boiler, designed for larger properties with higher heating and hot water demand. As the highest output model in the Greenstar CDi Classic system boiler range, it was a popular choice for homes with multiple bathrooms where a constant and reliable supply of hot water was essential.
Unlike a combi boiler, a system boiler works alongside a separate hot water cylinder. This means it can deliver hot water to multiple taps and showers simultaneously without any loss of pressure, making it well suited to busy family homes.
The 35CDi Classic was part of the Greenstar CDi Classic range, which set the benchmark for efficiency in the UK heating industry and won the Which? Best Buy award multiple times during its production life.
> Explore the full Worcester Bosch Greenstar range
Greenstar 35CDi Classic: Key Specifications
Boiler type: System boiler
Central heating output: 35kW
Efficiency rating: A rated / 92%
Fuel type: Natural gas or LPG
Dimensions: 760mm x 440mm x 360mm
Flow rate: 14.3 litres per minute
Frost protection: Yes
Solar compatible: Yes, Greenskies panels
Suitable for: 4 to 6 bed homes, multiple bathrooms
Who is this boiler suitable for?
The 35CDi Classic was designed for larger properties with a high demand for heating and hot water. It is best suited to homes with:
- 4 to 6 bedrooms
- 2 or more bathrooms
- An existing hot water cylinder
- 12 or more radiators
- Higher than average hot water usage
If you already have a 35CDi Classic 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 35CDi Classic
Although the 35CDi Classic 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 and surrounding areas.
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 35CDi Classic 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 35CDi Classic
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 35CDi Classic has been replaced by the Worcester Bosch Greenstar 8000 Life, which offers meaningful improvements across efficiency, warranty and controls.
The Greenstar 8000 Life 35kW system boiler is the natural modern equivalent for larger homes currently running a 35CDi Classic. It delivers better efficiency, a longer warranty and full compatibility with the Bosch EasyControl smart thermostat.
Greenstar 35CDi Classic vs Greenstar 8000 Life 35kW
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 models, across Buckinghamshire, Berkshire and surrounding areas.
- 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 installations
FAQs – Worcester Bosch Greenstar 35CDi Classic
Is the Worcester Bosch Greenstar 35CDi Classic still available to buy?
No. The 35CDi Classic is no longer manufactured. The modern equivalent is the Worcester Bosch Greenstar 8000 Life 35kW system boiler, which offers improved efficiency and a longer warranty.
Can the Greenstar 35CDi Classic still be serviced?
Yes. Parts remain widely available and our Gas Safe engineers service and repair all CDi Classic models across Buckinghamshire and Berkshire. Annual servicing is recommended to maintain efficiency and safety.
What replaced the Greenstar 35CDi Classic?
The Greenstar 35CDi Classic was replaced by the Worcester Bosch Greenstar 8000 Life. 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.
How efficient is the Greenstar 35CDi Classic?
The 35CDi Classic achieves 92% seasonal efficiency with an ErP A rating. Modern replacements such as the Greenstar 8000 Life achieve up to 94%, which can make a noticeable difference to running costs over time.
What size home is the Greenstar 35CDi Classic suitable for?
The 35CDi Classic is suited to larger homes with 4 to 6 bedrooms, multiple bathrooms and an existing hot water cylinder. For smaller properties, the 30CDi Classic was the more appropriate choice within the same range.
How long should a Greenstar 35CDi Classic last?
With regular annual servicing, a well-maintained 35CDi Classic 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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