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Greenstar 30Si (discontinued July 2013)

Mother and son with Greenstar boiler in background
Greenstar Si boiler


Which? Logo 2012The Greenstar Si combi boilers are our mid-range appliances.

They’re suitable for apartments and small to medium sized 1 bathroom properties.

You can control both the hot water and central heating temperatures on a Greenstar Si boiler. There is also a range of optional controls available, offering you further comfort and flexibility.

For further peace of mind, every boiler in Worcester’s Greenstar gas and LPG condensing boiler range has been awarded a Which? Best Buy accreditation.

Image of 5 year guarantee logo (with extra padding)5 year boiler guarantee until 31st December 2013 (terms and conditions apply). See promo page for details.

10 year guarantee on primary heat exchanger.

Central heating output: 24kW
Domestic hot water flow rate: 12.3 litres per minute at 35 degree temperature rise (provided adequate mains water pressure is available)
Designed operational flow rate 10.7 litres per minutes at 40 degree temperature rise.


  • The ErP Directive is a new EU regulation designed to drive improvements in the efficiency of heating and hot water products. Most boilers will fall within the A band, meaning they achieve more than 90% seasonal efficiency, while renewable technologies such as heat pumps will likely be in the A+ or A++ bands.
  • EST registeredThis boiler is registered with the Energy Saving Trust.
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Features and benefits

  • Best boiler efficiency rating (SEDBUK band A)
  • Keep hot facility - instantly available hot water
  • Metal wall mounting frame allows pipework to be hidden from view

  • Low NOx and CO2 emissions - environmentally friendly

  • 5 year boiler guarantee until 31st December 2013, terms and conditions apply (standard guarantee: 2 years)

  • 10 year guarantee on primary heat exchanger
  • 5 year anti-scale guarantee on domestic hot water heat exchanger

  • Hot water and central heating temperatures can be controlled

  • Multi-directional fluing means boiler can be sited in a wide variety of places
  • Mechanical and digital controls all compatible

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Worcester installer helping a customer choose the correct product

As a manufacturer, we supply through trade rather than directly to the public which is why we are unable to publish prices on our website.

Your local Worcester Accredited Installer, who can be found using the search below, will be happy to contact you and provide you with a free quote. Worcester Accredited Installers specialise in Worcester products and many can offer extended warranties.

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