Greenstar Gas System Boiler Models

Greenstar system boilers are known for their high quality and reliability, making them robust enough to stand up to the highest heating and hot water demands.

Ultra efficient and economical to run, Worcester system boilers incorporate many of the heating and hot water components found in a traditional heating system, making installation cheaper, less disruptive and neater.

The compact size of the Greenstar i System boilers means that they can fit perfectly into a wide variety of locations, with the 27kW and 30kW models even fitting into a standard kitchen cupboard.

Worcester system boilers can be used with a wide choice of optional controls, to maxmise comfort and energy efficiency, and are also perfectly matched to the comprehensive range of Worcester Greenstore hot water cylinders.

Worcester Greenstar CDi Classic System series

The Greenstar CDi Classic System is the top of the range wall mounted system boiler that is suitable for larger homes.

This boiler can be used with the range of high efficiency Greenstore cylinders allowing stored hot water to be rapidly replenished.

Key benefits of the Worcester Greenstar CDi Classic System boiler:

  • Highest central heating output of the Greenstar system boiler range
  • Simple boiler control knobs with digital display and one button commissioning mode
  • Our CDi Classic has set the heating industry benchmark for efficiency, helping to reduce energy usage
  • Low energy pump reduces electrical usage
  • Frost protection is included, reducing frost risk if installed in a garage or a loft
  • Can be used with Greenskies solar panels for energy and cost savings
  • Choice of controls enables greater comfort and economy
  • Large Condensesure style siphon built into the boiler – effectively eliminates frost risk

Fitted from £2370 Inc. VAT

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Greenstar 30CDi Classic System Greenstar 35CDi Classic System

ErP Efficiency Rating – Water Heating
A A

ErP Efficiency Rating – Space Heating
A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes

Wave Compatible
Yes Yes

Solar Compatible
Yes Yes

Control Options
Yes Yes

Central heating output (kW)
30 34

Dimensions (mm) height x width x depth
760 x 440 x 360 760 x 440 x 360

Worcester Greenstar i System (27kW and 30kW)

The higher output Greenstar i System boiler is part of that latest generation of smaller and lighter boilers.

Suitable for small, medium and large homes, the boiler can also be fitted in a standard kitchen cupboard.

This boiler can be used with Worcester’s range of high efficiency Greenstore cylinders for a complete Worcester system solution for your home.

Key benefits of the Worcester Greenstar i System boiler:

  • Fits in a standard kitchen cupboard
  • Simple boiler control knobs with clear temperature display
  • User-friendly displays for ease of use
  • Can be used with Greenskies solar panels for energy and cost savings
  • Low energy pump reduces electrical usage

Fitted from £2143 Inc. VAT

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Greenstar 27i System Greenstar 30i System

ErP Efficiency Rating – Water Heating
A A

ErP Efficiency Rating – Space Heating
A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

LPG model available
Yes Yes

Wave Compatible
Yes Yes

Solar Compatible
Yes Yes

Control Options
Yes Yes

Central heating output (kW)
27 30

Dimensions (mm) height x width x depth
690 x 390 x 280 690 x 390 x 280

Worcester Greenstar i System series (9kW to 24kW)

The Greenstar i System boiler is Worcester’s most popular system boiler that is suitable for small to medium sized homes.

This boiler can also be used with Worcester’s high efficiency Greenstore cylinders for a complete Worcester system solution for your home.

Key benefits of the Worcester i System boiler:

  • Simple boiler controls with clear information display
  • Suitable for homes where the heating system includes a hot water storage cylinder
  • Choice of controls enables greater comfort and economy*
  • Can be used with Greenskies solar panels for energy and cost savings
  • Low energy pump reduces electrical usage
  • Large Condensesure style siphon built into the boiler – eliminates frost risk**

Fitted from £1936 Inc. VAT

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Greenstar 9i System Greenstar 12i System Greenstar 15i System Greenstar 18i System Greenstar 21i System Greenstar 24i System

ErP Efficiency Rating – Water Heating
A A A A A A

ErP Efficiency Rating – Space Heating
A A A A A A

ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet


ErP Data Sheet

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

New Boiler Special Offer

For a limited time period, when you buy any new gas boiler, we’re offering your first year’s service worth £78 (inc.VAT) absolutely FREE.

Contact us today to get your quote and find out more.

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