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Worcester Bosch Greenstar 18i System Gas Boiler

From: £2,249.00

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Worcester Bosch


Greenstar 18i System Gas Boiler

Is Condensing


Efficiency Rating


Band Rating

A Rating

LPG Compatible


Standard Warranty

Up to 7 Years

Central Heating Max. Output

18.4 kW


Wall Mounted

Flow Rate


ERP Rating

A Heat

Product Description

The Greenstar 18i is a highly efficient wall mounted boiler by Worcester Bosch. It is a system boiler that is perfect for properties with up to 15 radiators.

How efficient is the Worcester Bosch Greenstar 18i?

Thanks to a 94% efficiency rating this is a ErP A-rated boiler that can help to lower your heating bills.

Is the output rating suitable for my home?

The central heating output rating of 18.4 kW makes this Greenstar 18i the perfect boiler for homes with up to 15 radiators. It’s also capable of meeting higher demands for hot water as they’re installed alongside a hot water cylinder.

Are any other options available in the range?

The Greenstar i range of system boilers offers plenty of choice. If you need a lower output rating then models with outputs of 9 kW to 15 kW are also available. Plus, if you need a more powerful boiler then additional outputs up to 30 kW can be found too.

Is a system boiler suitable for my home?

System boilers are installed alongside a hot water cylinder which stores domestic hot water – allowing them to meet higher demand. However, this does take up additional space so they’re not an option for properties with limited space.

How long is the warranty period?

A warranty period of up to 7 years is available on the Greenstar i range when installed by a Worcester Bosch accredited installer.

What are the key features of the Greenstar 15i?

The Greenstar 18i is compatible with a wide range of accessories such as the Greenskies solar panels helping to cut your energy down as well as reducing your bills. It can also be used in conjunction with the high efficiency Greenstore cylinders.

With the Greenstar being designed with you in mind it comes with a simple clear information display making it easy to use. As well as the wide range of controls, it is built with the best technology to help make it a more reliable boiler. It boasts a low energy pump that helps to reduce the electrical usage, and a large condensesure style siphon that is built into the boiler to help reduce the risk of frost on the unit.

How big is the Greenstar 18i?

Greenstar i system boilers are compact units with measurements of 710 x 400 x 330 (HxWxD).