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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 29CDi Classic 30.9 760 x 440 x 360 12.3
Greenstar 34CDi Classic 34 760 x 440 x 360 14.3
Greenstar 38CDi Classic 40 760 x 440 x 360 16.4
Greenstar 42CDi Classic 42 760 x 440 x 360 17.2

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 Model Energy (kW) Dimensions Flow (ltr/min)
Greenstar 28CDi Compact 28 690 x 390 x 280 11.4
Greenstar 32CDi Compact 32 690 x 390 x 280 13.1
Greenstar 36CDi Compact 36 690 x 390 x 280 14.7

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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 25Si Compact 24 710 x 430 x 330 10.2
Greenstar 30Si Compact 30 710 x 430 x 330 10.2

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 Model Energy (kW) Dimensions Flow (ltr/min) Greenstar 440CDi Highflow 28 850 x 600 x 600 11.4 Greenstar 550CDi Highflow 32 850 x 600 x 600 13.1

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 Model Energy (kW) Dimensions Flow (ltr/min)
Greenstar 30CDi Classic System 30 760 x 440 x 360 11.4
Worcester Greenstar 35CDi Classic System 35 760 x 440 x 360 13.1

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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 9i System 9 710 x 400 x 330 N/A
Greenstar 12i System 12 710 x 400 x 330 N/A
Greenstar 15i System 15 710 x 400 x 330 N/A
Greenstar 18i System 18 710 x 400 x 330 N/A
Greenstar 21i System 21 710 x 400 x 330 N/A
Greenstar 24i System 24 710 x 400 x 330 N/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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 27i System 27 690 x 390 x 280 N/A
Greenstar 30i System 30 690 x 390 x 280 N/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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 27Ri System 12/td> 600 x 390 x 270 N/A
Greenstar 30Ri System 15 600 x 390 x 270 N/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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 12Ri System 12 600 x 390 x 270 N/A
Greenstar 15Ri System 15 600 x 390 x 270 N/A
Greenstar 18Ri System 18 600 x 390 x 270 N/A
Greenstar 24Ri System 24 600 x 390 x 270 N/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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 27Ri System 30.9 600 x 390 x 270 N/A
Greenstar 30Ri System 42 600 x 390 x 270 N/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 Model Energy (kW) Dimensions (L x W x D) Flow (ltr/min)
Greenstar 30CDi FS Regular 30.9 850 x 400 x 600 N/A
Greenstar 42CDi FS Regular 42 850 x 400 x 600 N/A

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