We are Worcester Bosch Accredited Installers 

Being accredited installers for Worcester Bosch we are able to offer extended boiler warranties of up to 10 years on every Bosch gas boiler installed by our expert gas boiler engineers. Worcester Bosch gas boilers are designed and built using only the highest quality and best materials, its no wonder they have been awarded the coveted Which? Best Buy for the last 7 years.

Gasworks are experts when it comes to the Worcester Bosch range of boilers, our close working relationship gives us access to unrivalled product training and support. This ensures no-one knows Worcester Bosch better than Gasworks.

Worcester Bosch for peace of mind

Worcester Bosch boilers are built to last, but don’t just take our word for it. In a recent Which? survey for gas boiler reliability, Worcester came out as the most reliable gas boiler brand on the market. Nevertheless if you are experiencing an issue with your Bosch gas boiler, Worcester offer unrivalled support and backup 365 days of the year, this is further backed up by Gasworks.

Benefits of a Bosch Gas Boiler
• Up to 10 Year Warranty
• 365  Technical Support Helpline
• Which? Best Buy Winner
• Highest Parts and Components
• Best for Reliability

Worcester Bosch Boiler Range 


Worcester Bosch – Greenstar Ri (12kW to 24kW)                            

The Worcester Bosch Greenstar Ri Condensing gas boiler is a compact heat-only boiler, available for both LPG and Natural Gas and four output sizes 12KW, 15KW, 18KW and 24KW making it an ideal boiler replacement option for small to medium sized homes. The compact size of this gas boiler makes for a comfortable fit in a standard kitchen cupboard. The Boiler also has built in frost protection, providing invaluable frost protection especially in the case of a loft, garage or boiler house installation. The boiler controls are both simple and easy to use, they comprise of a boiler thermostat and on/off switch. This user-friendly gas boiler comes with a 7-year warranty as standard when installed by Gasworks.                     

  • Compact Size                                                                                                                                                           
  • User Friendly Controls 
  • Frost Protection 
  • 7 Year Warranty Bosch 
  • “Which” Best Buy Winner 
  • “A” Rated 
  • LPG and Natural Gas Models 
  • Available in 12KW, 15KW, 18KW and 24KW 

Get A Boiler Replacement Quote Now 


Worcester Bosch Greenstar Ri Technical Details 

  Greenstar 12Ri  Greenstar 15Ri  Greenstar 18Ri  Greenstar 24Ri 
ErP Efficiency Rating  A 








Natural Gas Model Available  yes   yes  yes   yes
LPG Model Available yes  yes  yes  yes 
Worcester Wave Compatible  no  no  no  no 
Solar Hot Water Compatible  yes  yes  yes  yes 
Worcester Control Options  no  no  no  no 
Central heating output (kW)  12  15  18  24 
Dimensions (mm) height x width x depth  600 x 390 x 270  600 x 390 x 270  600 x 390 x 270  600 x 390 x 270 


 The Greenstar Ri range of Gas Boilers come with a full 7 Year Parts and Labour warranty when installed by Gasworks


Worcester Bosch – Greenstar i System (9kW to 24kW)  

 The Worcester Bosch I System gas boiler is our most popular gas boiler, it is available in 9KW, 12KW, 15KW, 18KW, 21KW and 24KW outputs, this broad range of outputs makes it an excellent replacement option for the small to medium sized homes. Being a system boiler, it incorporates the circulation pump, expansion vessel and pressure relief valve. All of which are covered during the term of the extended warranty. Warranties range from 7-10 Years depending on installation practices.  

The boiler controls are both simple and easy to use incorporating a digital display screen, additional Worcester control options are available to use with the Greenstar i System boiler range. This allows for better preforming heating system increasing comfort while further reducing operational costs. The low energy circulation pump contained within the boiler, modulates to suit the boiler output this modulation results in reduced electrical usage. 

  • Digital Display 
  • Easy to use Boiler controls 
  • Compatible with Worcester Control Range 
  • 7-10 Year Warranty 
  • Energy Saving Circulation Pump 
  • Which? Best Buy Winner 
  • Reliability Tested 

Worcester Bosch Greenstar i System Technical Details

Greenstar 9i System Greenstar 12i System Greenstar 15i System Greenstar 18i System Greenstar 21i System Greenstar 24i System
ErP Efficiency Rating
A Rated


A Rated


A Rated


A Rated


A Rated


A Rated


Natural Gas Model Available yes yes yes yes yes yes
LPG model available  yes  yes  yes  yes  yes  yes
Wave Compatible   yes  yes  yes  yes  yes  yes
Solar Compatible  yes  yes  yes  yes  yes  yes
Control Options  yes  yes  yes  yes  yes  yes
Central heating output (kW) 9 12 15 18 21 24
Dimensions (mm) height x width x depth 710 x 400 x 330 710 x 400 x 330 710 x 400 x 330 710 x 400 x 330 710 x 400 x 330 710 x 400 x 330