New Worcester Bosch Boilers

Our bestselling boilers

As part of the Bosch Group, Worcester Bosch boilers are designed and built to exacting standards and constructed with only the highest quality materials

Worcester boilers provide the levels of quality and service that you would expect from a brand within the Bosch Group. Every single boiler is rigorously tested before it leaves the factory.


Worcester Greenstar CDi Classic

Key features:

  • Type: Combination Boiler
  • Fuel Type: Gas or LPG
  • Warranty: 8 Years*
  • Fitting: Wall mounted
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: A
  • SEDBUK 2009 (%) Natural Gas: 89.1%
  • SEDBUK 2009 (%) LPG: 90.1%
  • Compatible with solar panels

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 29CDi Classic30.9760 x 440 x 36012.3
Greenstar 34CDi Classic34760 x 440 x 36014.3
Greenstar 38CDi Classic40760 x 440 x 36016.4
Greenstar 42CDi Classic42760 x 440 x 36017.2

Greenstar CDi Compact

Key features:

  • Type: Combination Boiler
  • Fuel Type: Gas or LPG
  • Warranty: 8 Years*
  • Fitting: Wall mounted
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: A
  • SEDBUK 2009 (%) Natural Gas: 89.8%
  • SEDBUK 2009 (%) LPG: 90.9%

Available models:

Boiler ModelEnergy (kW)DimensionsFlow (ltr/min)
Greenstar 28CDi Compact28690 x 390 x 28011.4
Greenstar 32CDi Compact32690 x 390 x 28013.1
Greenstar 36CDi Compact36690 x 390 x 28014.7

Greenstar Si Compact

Key features:

  • Type: Combination Boiler
  • Warranty: 8 Years*
  • Fitting: Wall mounted
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: A
  • SEDBUK 2009 (%) Natural Gas: 89.8%
  • SEDBUK 2009 (%) LPG: 90.9%

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 25Si Compact24710 x 430 x 33010.2
Greenstar 30Si Compact30710 x 430 x 33010.2

Greenstar CDi Highflow

Key features:

  • Models: 25Si | 30Si
  • Type: Combination Boiler
  • Warranty: 8 Years*
  • Fitting: Floor standing
  • Measurements: 850h x 600w x 600d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: B
  • SEDBUK 2009 (%) Natural Gas: 89.2%
  • SEDBUK 2009 (%) LPG: 90.2%
  • Domestic hot water flow rate: 20.0 ltr/min
  • Central heating output: 29.2kW / 30.6KW

Available models:Boiler ModelEnergy (kW)DimensionsFlow (ltr/min)Greenstar 440CDi Highflow28850 x 600 x 60011.4Greenstar 550CDi Highflow32850 x 600 x 60013.1


30 CDi Classic System

Key features:

  • Models: 30CDi | 35CDi
  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall hung
  • Measurements: 760h x 440w x 360d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 89.2%
  • SEDBUK 2009 (%) LPG: 90.2%
  • Domestic hot water flow rate: N/A
  • Central heating output: 30.0kW / 34.0KW

Available models:

Boiler ModelEnergy (kW)DimensionsFlow (ltr/min)
Greenstar 30CDi Classic System30760 x 440 x 36011.4
Worcester Greenstar 35CDi Classic System35760 x 440 x 36013.1

Greenstar i System (9kW to 24kW)

Key features:

  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall mounted
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 89.7%
  • SEDBUK 2009 (%) LPG: 90.7%
  • Domestic hot water flow rate: N/A
  • Central heating output: 9.0kW to 24.0KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 9i System9710 x 400 x 330N/A
Greenstar 12i System12710 x 400 x 330N/A
Greenstar 15i System15710 x 400 x 330N/A
Greenstar 18i System18710 x 400 x 330N/A
Greenstar 21i System21710 x 400 x 330N/A
Greenstar 24i System24710 x 400 x 330N/A

Greenstar i System (27kW to 30kW)

Key features:

  • Models: 27i | 30i
  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall hung
  • Measurements: 690h x 390w x 280d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 89.0%
  • SEDBUK 2009 (%) LPG: 90.0% / 90.9%
  • Domestic hot water flow rate: N/A
  • Central heating output: 9.0kW to 24.0KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 27i System27690 x 390 x 280N/A
Greenstar 30i System30690 x 390 x 280N/A

Greenstar CDi Classic Regular

Key features:

  • Models: 27i | 30i
  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall hung
  • Measurements: 760h x 440w x 360d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 89.2%
  • SEDBUK 2009 (%) LPG: 90.0% / 90.2%
  • Domestic hot water flow rate: N/A
  • Central heating output: 30.0kW / 40.8KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 27Ri System12/td>600 x 390 x 270N/A
Greenstar 30Ri System15600 x 390 x 270N/A

Greenstar Ri System (12kW to 24kW)

Key features:

  • Models: 12Ri | 15Ri | 18Ri | 24Ri
  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall hung
  • Measurements: 600h x 390w x 270d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 88.8%
  • SEDBUK 2009 (%) LPG: 89.8%
  • Domestic hot water flow rate: N/A
  • Central heating output: 9.0kW to 24.0KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 12Ri System12600 x 390 x 270N/A
Greenstar 15Ri System15600 x 390 x 270N/A
Greenstar 18Ri System18600 x 390 x 270N/A
Greenstar 24Ri System24600 x 390 x 270N/A

Greenstar i System (27kW and 30kW)

Key features:

  • Models: 27Ri | 30Ri
  • Type: System Boiler
  • Warranty: 8 Years*
  • Fitting: Wall hung
  • Measurements: 600h x 390w x 270d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 89.0%
  • SEDBUK 2009 (%) LPG: 90.0% / 90.9%
  • Domestic hot water flow rate: N/A
  • Central heating output: 9.0kW to 24.0KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 27Ri System30.9600 x 390 x 270N/A
Greenstar 30Ri System42600 x 390 x 270N/A

Greenstar CDi FS Regular

Key features:

  • Models: 30CDi | 42CDi
  • Type: Regular Boiler
  • Warranty: 8 Years*
  • Fitting: Floor standing
  • Measurements: 850h x 400w x 600d
  • ErP Seasonal Space Heating energy efficiency class: A
  • ErP Water Heating energy efficiency class: N/A
  • SEDBUK 2009 (%) Natural Gas: 88.8% / 88.9%
  • SEDBUK 2009 (%) LPG: 89.9% / 89.9%
  • Domestic hot water flow rate: N/A
  • Central heating output: 30.0kW / 40.8KW

Available models:

Boiler ModelEnergy (kW)Dimensions (L x W x D)Flow (ltr/min)
Greenstar 30CDi FS Regular30.9850 x 400 x 600N/A
Greenstar 42CDi FS Regular42850 x 400 x 600N/A

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