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Worcester Bosch Greenstar 25Si Compact Combi Gas Boiler

From: £2,179.00

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Worcester Bosch


Greenstar 25Si Compact Combi Gas Boiler

Is Condensing


Efficiency Rating


Band Rating

A Rated

LPG Compatible


Standard Warranty

Up to 10 Years

Central Heating Max. Output

24 kW


Wall mounted

Flow Rate

10.2 l/min

ERP Rating


Hot Water Max. Output

25 kW

Product Description

The Worcester Bosch Greenstar 25Si Compact is an efficient gas boiler designed for wall-mounted installation in properties with a single bathroom.

How efficient is the Greenstar 25Si Compact?

A seasonal space heating efficiency rating of 94% and ErP A-rating makes this a highly efficient boiler that could help to lower your heating bills.

Is the output rating suitable for my home?

As a combi boiler, the Greenstar 25Si has a central heating output of 24 kW and domestic hot water output of 25 kW. As a result, it’s well suited to properties with up to 10 radiators and 1 bathroom.

Are any other options available in the Greenstar Si Compact range?

Should you need a higher domestic hot water output to meet your needs then the 30Si has a 30 kW output rating.

Is a combi boiler suitable for my home?

The Greenstar 25Si Compact is the perfect heating system for properties with 1 bathroom. As a combi, they’re ideal for properties with limited space as there’s no need for any tanks or cylinders.

How long is the warranty period?

After the installation of a Greenstar 25Si Compact, you will be covered by Worcester Bosch for a period of up to 10 years.

What are the key features of the Greenstar 25Si Compact?

Key features of this compact heating system include boiler frost protection, user-friendly controls and a low energy pump to reduce electricity consumption.

How big is the Greenstar 25Si Compact?

Measurements of only 690 x 390 x 280mm (HxWxD) make this a very compact boiler that can be installed within a kitchen cupboard.