A system boiler will provide heating together with the power to heat water to be stored within a cylinder as part of a sealed system, meaning there is no need for an expansion tank in the loft space. The sxi range of condensing system boilers offers a superior level of high efficiency performance. These boilers provide excellent heating performance while protecting the environment and saving householders money. These boilers have achieved the highest energy efficiency rating possible being listed as SEDBUK ‘A’ and gained top marks for low emissions with a NOx class 5 rating the best possible. The fuel saving performance of the sxi range has been combined with an impressive range of features and they look great too! On-board diagnostics provide superior serviceability and Glow-worm's unique 'continua'© electronics will allow these boilers to continue where others may fail due to system faults. Fitted as standard are an inbuilt bypass, frost protection system and anti-seizure controls. Extensive flueing options are a feature of all new Glow-worm boilers, allowing greater flexibility in installation.