WORCESTER BOSCH GREENSTAR 27i CLASSSIC SYSTEM
The Worcester Bosch Greenstar 27i Classic System was a powerful and compact wall-mounted system boiler from the Greenstar i range and remains installed in many medium to 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 27i Classic System? Contact our Worcester Bosch accredited and Gas Safe engineers.
What is the Greenstar 27i Classic System?
The Greenstar 27i Classic System is a wall-mounted gas system boiler from Worcester Bosch’s extended Greenstar i range. With a 27kW output and compact cupboard-sized dimensions, it was designed for medium to larger homes that needed greater heating capacity without sacrificing installation flexibility.
As a system boiler, it works alongside a separate hot water cylinder to store and deliver hot water on demand. With its higher output, it was particularly well suited to homes with multiple bathrooms and higher heating demand, while its compact footprint allowed installation in a standard kitchen cupboard.
The 27i Classic System was part of Worcester Bosch’s most popular wall-mounted system boiler range, consistently winning the Which? Best Buy award and well regarded for its reliability and A-rated efficiency.
> Explore the full Worcester Bosch Greenstar range
Greenstar 27i Classic System: Key Specifications
✔ Boiler type: System boiler
✔ Central heating output: 27kW
✔ Efficiency rating: A rated / 92%
✔ Fuel type: Natural gas or LPG
✔ Dimensions: 690mm x 390mm x 280mm
✔ Frost protection: Yes
✔ Solar compatible: Yes, compatible with Greenskies panels
✔ Smart control compatible: Yes, including Bosch EasyControl
✔ Suitable for: Medium to larger homes, up to 20 radiators, 2 or more bathrooms with cylinder
Who is this boiler suitable for?
The 27i Classic System was designed for medium to larger homes with an existing hot water cylinder and higher heating demand. It is best suited to properties with:
- 3 to 5 bedrooms
- 2 or more bathrooms
- Up to 20 radiators
- An existing hot water cylinder
- No loft cold water tank required
The 27i Classic System offered a notable step up in output from the 24i Classic System, making it the preferred choice for larger homes. For homes with even greater demand, the 30i offered the highest output in the compact system range. If you already have a 27i 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 27i Classic System
Although the 27i 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 27i 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 27i 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 27i Classic System has been replaced by the Worcester Bosch Greenstar 8000 Life System, which is the most suitable modern equivalent for medium to larger homes with higher heating demand.
The Greenstar 8000 Life 30kW System is the natural modern equivalent for homes currently running a 27i Classic System. It delivers better efficiency, a longer warranty and full compatibility with the Bosch EasyControl smart thermostat.
Greenstar 27i Classic System vs Greenstar 8000 Life 30kW System
Efficiency: 92% vs up to 94%
Warranty: 5 to 7 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 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 12-year warranty available on new Greenstar 8000 Life installations
> Request a free quote or call 01628 533 550
FAQs – Worcester Bosch Greenstar 27i Classic System
Is the Worcester Bosch Greenstar 27i Classic System still available to buy?
No. The 27i Classic System is no longer manufactured. The modern equivalent for medium to larger homes is the Worcester Bosch Greenstar 8000 Life 30kW System boiler, which offers improved efficiency and a longer warranty.
Can the Greenstar 27i 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 27i Classic System?
The Greenstar 27i 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.
Will the Greenstar 27i Classic System fit in a kitchen cupboard?
Yes. Unlike the larger i System models, the 27i Classic System has compact dimensions of 690mm x 390mm x 280mm, allowing it to be installed inside a standard kitchen cupboard. This made it a popular choice for larger homes where space-saving installation was still a priority.
What size home is the Greenstar 27i Classic System suitable for?
The 27i Classic System is suited to medium to larger homes with 3 to 5 bedrooms, 2 or more bathrooms and up to 20 radiators. It requires a separate hot water cylinder but no cold water storage tank in the loft.
How long should a Greenstar 27i Classic System last?
With regular annual servicing, a well-maintained 27i 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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