Greenstar 30Si Compact

Greenstar CDi Compact combi boilers are the smallest and most efficient boilers we have produced. They are suited to properties that demand high outputs from a boiler that can fit within a standard kitchen cupboard (a standard cupboard is 720mm high by 600mm wide by 300mm deep).


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

Ideal for 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.

5 year guarantee (with extra padding)5 year boiler guarantee as standard (terms and conditions apply).

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.

This boiler is registered with the Energy Saving Trust.

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