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Glow-worm provides a wide range of combination or "combi" boilers ideal for any domestic environment. Glow-worm Combi boilers are easy to install, simple to use and maintain. They are manufactured to be extremely reliable and their high efficiency reduces unnecessary energy use which both reduces central heating and hot water bills while also being kind to the environment by minimising the emission of negative gasses such as CO2 and NOx. The fact that water is heated when required is responsible for the efficient process and also eliminates the need for a bulky hot water tank making combi boilers ideal for domestic setting.

Glow-worm have a range of combi boilers: the Ultracom CXI, Flexicom CX, Ultracom CX, Betacom and Xtramax HE models. These are all extremely efficient and all apart from Betacom are more than 90% efficient giving them A-ratings in the SEDBUK ("Seasonal Efficiency in Domestic Boilers in the United Kingdom") database. The Betacom has a B-rating. The different lines of combi boilers are specifically designed with different sized homes and consumers in mind in terms of their energy outputs and flow rate capacities. Apart from the Xtramax HE model, all the combi boilers come with a choice of output which ranges from 24kW to 38kW. The smallest and least powerful boiler is perfect for a one-bedroom apartment or flat whereas the largest can cater to the hot water and central heating demands of a 5-bedroom detached home. The Glow-worm Combis come with a range of key features such as in-built frost protection and self-diagnostics designed to make the boilers straightforward for consumers to install and operate.