Created from the DNA of the UK’s best-selling Greenstar i

Coming soon, the Greenstar 4000 keeps everything you love and then raises the bar with the ease of installation, commissioning and servicing.

The 4000 range includes:

  • 25kW and 30kW combi
  • 12 – 24kW system

With hot water flow rates up to 12.3 l/min, the Greenstar 4000 will be available in natural gas and LPG. It will also carry the same guarantee lengths as its predecessor the Greenstar i.

Quoting a Greenstar i Junior or Si boiler replacement (2005-2015 model)? Our simple switch wall-frame makes our new 4000 the easiest option with minimal pipework changes.

We cannot wait to soon share with you all of the features and benefits that come with the 4000!

Our Greenstar i boilers will still be in stock at merchants throughout May.



Join our Excelerate loyalty programme

We’ll let you know as soon as the 4000 is available to order.  We’ll also be posting you an Installers’ Choice special which details all the enhancements made.

Sign up


Join our ‘Worcester Bosch Training Academy’ Facebook group

Join our ‘Worcester Bosch Training Academy’ Facebook group where we’ll be releasing daily bite size training videos on the 4000 from launch.

Our trainers, with over 350+ years of experience, share regular content covering a wide range of topics and products, such as how to videos, guides, quizzes and more!

Joining the group is easy, follow these instructions:

  1. Search ‘Worcester Bosch Training Academy’ on Facebook
  2. Click ‘Join Group’
  3. Answer the 2 questions, ‘What is your role within the industry’ and ‘What is your company name, registration number, college or learning provider’.


Join our virtual and face to face events

We’ll be running a series of online events where we’ll reveal everything behind the case and more.  The events are available to all with a gas safe number.

When the time is right and it’s safe to do so, we’ll also be hosting face to face events up and down the country.


Why Worcester Bosch

Sign up to Excelerate

Sign up to Excelerate

Open to all installers, earn loyalty points when you install our Greenstar boilers and accessories!

10 year guarantee

10 year guarantee

Available to Excelerate members. Non-Worcester Accredited Installers, can achieve this guarantee length by fitting any Greenstar System Filter and a £150 payment.

Terms and conditions apply.

easy switch between bosch boilers

Simple Switch

A real time-saver for seamless swapping out with iJunior, Si combi and i System boilers (2005-2015).