Worcester Bosch Greenstar 21i System Boiler

Worcester Bosch Greenstar 21i System Boiler

SKU: BC-379



This product is not sold by WarmZilla
The Worcester Bosch Greenstar 21i system gas boiler is well known for its reliability and efficiency, with a rating of 94% for energy efficiency and an ErP A-rating for central heating.

The Worcester Bosch Greenstar i range has become a very popular choice when it comes to a new or replacement system boiler. With an output range of between 9kW and 30kW, there is an option for everyone. However, it is important to remember that you will also need a hot water cylinder tank when your system boiler is installed. This will store your hot water for when it’s needed.

For this reason, system boilers are not recommended for homes with limited space. On the plus side, the Worcester Bosch Greenstar i range is also available as a combi boiler for smaller homes. 

This system boiler is perfect for homes with up to 15 radiators and a bathroom. If you are looking for a boiler that meets a higher demand for central heating and hot water, the Greenstar 24i, 27i, or 30i are available. If your home has lower demand, there are output levels of 9kW, 12kW, 15kW and 18kW that are also available. For medium-sized homes, this is a good choice of boiler. 

kW Output
21 KW
ERP Rating
A Rated
Energy Efficiency
94 %
Which Review Score
Brochure URL
Height 710mm
Width 400mm
Depth 330mm