Worcester Greenstar Ri Review December 02, 2020 Worcester Greenstar Ri Regular Boiler. The Greenstar Ri regular boiler range are the smallest of the Worcester condensing boilers, they can even be installed within a standard kitchen cabinet. Boiler dimensions are 600mm high x 390mm wide x 270mm deep. The Ri is a Regular boiler (sometimes known as traditional, conventional or heat only boiler) is ideally suited to homes that already have a traditional heating and hot water system which is linked to a separate hot water storage cylinder. These boilers are available in 8 different outputs (9, 12, 15, 18, 21, 24, 27 and 30kW) which means that there’s one to suit all homes, be it small, medium or large. The Greenstar Ri Regular boilers are compatible with greenstore domestic hot water storage cylinders. The Greenstar Ri boilers have a fascia mounted heating temperature control knob and neon operational status indicator. 8 year warranty when fitted with the Worcester filter. Maximum horizontal flue length 4.6M. ErP Seasonal space heating energy efficiency class A (92%). Built in heating temperature control. Compatible with Greenskies solar panels. Low NOx and CO2 emissions. Multi-directional flue for siting flexibility. For ease of installation, flow and return pipes can be plumbed in from above or below the boiler. Built in Frost protection. Lift weight: just 22.6kg which is the lightest boiler in its class. I personally really like this boiler range, it's simple and easy to work on, it's been tried and tested, it's a fantastic little boiler with a decent warranty at a great price.