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Worcester Greenstar 25Si Compact Combi & Standard Flue


Worcester Greenstar 25Si Compact Combi & Standard Flue

£2,162.42 £1,127.46

Worcester Greenstar 25Si Compact Combi Boiler & Standard Flue

5 Year Guarantee

Height: 690mm (max)

Width: 390mm

Depth: 280mm(max)



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The all new Greenstar gas-fired Si Compact is the successor to the Greenstar Si combi boiler.

Ideal for apartments and small to medium sized properties with one bathroom, it has a host of performance-enhancing features, including the revolutionary WB7 heat exchanger which enables the appliances to deliver DHW flow rates of 10.2 and 12.3 l/min despite their compact size.

The new Greenstar Si Compact has been designed to make installation and commissioning easier and quicker and comes supplied with a unique wall-mounting jig which enables the installer to quickly pre-plumb all seven pipe connections without the boiler being on the wall.

Image of 5 year guarantee logo (with extra padding)5 year boiler guarantee  (terms and conditions apply).

10 year guarantee on primary heat exchanger.

Central heating output: 24kW
Domestic hot water flow rate: 10.2 litres per minute at 35 degree temperature rise (provided adequate mains water pressure is available)
Designed operational flow rate 8.9 litres per minutes at 40 degree temperature rise.


  • 90.5% AThe Greenstar 25Si Compact is 90.5% efficient and is in the highest possible official efficiency category, SAP 2005 seasonal efficiency rating.
  • This boiler is registered with the Energy Saving Trust.
  • A rated efficiency (SEDBUK 2005 value)
  • 5 year boiler guarantee terms and conditions apply (standard guarantee: 2 years)
  • 10 year guarantee on primary heat exchanger and 5 year anti-scale guarantee on domestic hot water heat exchanger (subject to terms and conditions)
  • Can be installed in a standard kitchen cupboard without the need for ventilation
  • Split jig design for optimum lift weight (32.9kg)
  • The expansion vessel has a simple drop lock mechanism that connects directly onto the hydraulic unit
  • Ability to pre-plumb all 7 connections without the boiler being on the wall – gas, water, PRV & condensate connections
  • Robust wall mounting frame provided as standard allows space for pipes behind the boiler
  • LCD boiler display for operation status, commissioning features and diagnostics
  • EMS-BUS compatibility enables use with Worcester intelligent controls series


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