Our Greenstar i System boiler is our most popular system boiler that is suitable for small to medium sized homes.This boiler can also be used with our high efficiency Greenstore cylinders for a complete Worcester system solution for your home. The Greenstar i System has been enhanced with a host of new features and expanded to include 9kW and 21kW output models, making the boilers suitable for an even wider range of properties. The appliance comes with a steel wall-mounting jig that not only allows pipes to go behind the boiler but also the ability to pre-pipe all of the pipework before the boiler is placed on the wall. In addition to this, the mounting points are the same as previous i System models, allowing straightforward replacement to take place. The range also boasts a new Heatronic i control panel, allowing the end user to adjust flow temperature with ease.