WORCESTER BOSCH GREENSTAR 24i CLASSIC SYSTEM
The Worcester Bosch Greenstar 24i Classic System was a popular and powerful wall-mounted system boiler from the Greenstar i range and remains installed in many medium-sized 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 24i Classic System? Contact our Worcester Bosch accredited and Gas Safe engineers.
What is the Greenstar 24i Classic System?
The Greenstar 24i Classic System is a wall-mounted gas system boiler and the highest output model in Worcester Bosch’s standard Greenstar i System range. With a 24kW output, it was the most capable model in the series and was well suited to medium-sized homes with an existing hot water cylinder and a higher demand for central heating.
As a system boiler, it works alongside a separate hot water cylinder to store and deliver hot water on demand. This makes it well suited to homes with multiple bathrooms that need hot water available at several outlets simultaneously, without needing a cold water storage tank in the loft.
The 24i Classic System was part of Worcester Bosch’s most popular wall-mounted system boiler range, consistently winning the Which? Best Buy award and recommended by the Energy Saving Trust.
> Explore the full Worcester Bosch Greenstar range
Greenstar 24i Classic System: Key Specifications
✔ Boiler type: System boiler
✔ Central heating output: 24kW
✔ Efficiency rating: A rated / 94%
✔ Fuel type: Natural gas or LPG
✔ Dimensions: 710mm x 400mm x 330mm
✔ Frost protection: Yes
✔ Solar compatible: Yes, compatible with Greenskies panels
✔ Smart control compatible: Yes, including Bosch EasyControl
✔ Suitable for: Medium homes, up to 15 radiators, 2 or more bathrooms with cylinder
Who is this boiler suitable for?
The 24i Classic System was designed for medium-sized homes with an existing hot water cylinder and a moderate to higher demand for central heating. It is best suited to properties with:
- 2 to 4 bedrooms
- 2 or more bathrooms
- Up to 15 radiators
- An existing hot water cylinder
- No loft cold water tank required
As the highest output model in the standard Greenstar i System range, the 24i Classic System was the natural choice for homes that outgrew the 21i. For homes with even greater demand, the 27i and 30i models in the extended range offered higher outputs. If you already have a 24i 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 24i Classic System
Although the 24i 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 24i 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 24i 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 24i Classic System has been replaced by the Worcester Bosch Greenstar 4000 System, which offers meaningful improvements across warranty and controls.
The Greenstar 4000 System is the natural modern equivalent for homes currently running a 24i Classic System. It delivers a longer warranty and full compatibility with the Bosch EasyControl smart thermostat.
Greenstar 24i Classic System vs Greenstar 4000 System
Efficiency: 94% vs up to 94%
Warranty: 5 to 7 years vs up to 10 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 4000
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 i range 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 10-year warranty available on new Greenstar 4000 installations
> Request a free quote or call 01628 533 550
FAQs – Worcester Bosch Greenstar 24i Classic System
Is the Worcester Bosch Greenstar 24i Classic System still available to buy?
No. The 24i Classic System is no longer manufactured. The modern equivalent is the Worcester Bosch Greenstar 4000 System boiler, which offers an improved warranty and smart control compatibility.
Can the Greenstar 24i Classic System still be serviced?
Yes. Parts remain widely available and our Gas Safe engineers service and repair all Greenstar i system models across Buckinghamshire, Berkshire and West London. Annual servicing is recommended to maintain efficiency and safety.
What replaced the Greenstar 24i Classic System?
The Greenstar 24i Classic System was replaced by the Worcester Bosch Greenstar 4000 system boiler range. The 4000 offers smart control compatibility and up to a 10-year warranty when installed by a Platinum Accredited Installer.
What is the difference between the 24i Classic System and the 21i Classic System?
Both are system boilers from the same Greenstar i range. The 24i Classic System delivers 24kW making it better suited to medium homes with 2 or more bathrooms, while the 21i Classic System delivers 21.6kW and is better suited to smaller homes with more modest demand.
What size home is the Greenstar 24i Classic System suitable for?
The 24i Classic System is suited to medium homes with 2 to 4 bedrooms, 2 or more bathrooms and up to 15 radiators. It requires a separate hot water cylinder but no cold water storage tank in the loft, making it suitable for homes with limited loft space.
How long should a Greenstar 24i Classic System last?
With regular annual servicing, a well-maintained 24i 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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