What Is A Combi Boiler
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Worcester Si Combi Boilers
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Flue Options i and si range

Worcester-Bosch 25si and 30si combi gas boilers

Combination Boilers



Worcester-Bosch Si Combination Boilers



The Greenstar Si boiler series is part of a market-leading range of energy-saving condensing gas-fired boilers from Worcester. They can cut heating and hot water bills by between 15-20% - and they’re up to 30% cheaper to run than an older boiler.

Greenstar condensing boilers deliver this energy-saving performance by recycling exhaust gases to extract and re-use latent heat - a highly efficient use of energy which also significantly reduces carbon dioxide in the atmosphere.

  • SEDBUK* A-rated efficiency - environmentally friendly
  • 25kW and 30kW domestic hot water (DHW) outputs
  • Hot water and central heating temperature controls - consumer comfort and flexibility
  • Mechanical, digital and radio frequency (RF) control options all available
  • Optimising 7-day programmable room thermostat available
  • Compact dimensions – space saving and siting flexibility
  • Keep hot facility - instantly available hot water
  • Includes wall mounting frame for optional vertical pipework routing- no additional wall spacing frame required
  • Low NOx and CO2 emissions - environmentally friendly
  • 2 year** warranty with 10 year** warranty on primary heat exchanger
Si Combi Boilers:
Greenstar 30Si   £1038.20 inc VAT  
Greenstar 25Si   £927.69 inc VAT  
STD Horizontal Flue   £69.84 inc VAT  
Vertical Flue   £95.76 inc VAT  
Mechanical Timer   £41.68 inc VAT  
Digital Timer   £55.20 inc VAT  















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