The hxi range of condensing boilers offers a superior level of high efficiency performance for open vented and sealed system applications. They provide excellent heating performance while protecting the environment and saving householders money. The hxi uses a single reliable stainless steel heat exchanger designed for easier servicing and dependability. 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 (NOx class 4 for 38hxi). The 30hxi is also suitable for LPG applications without the need for a conversion kit. The fuel saving performance 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 is a frost protection system. Extensive flueing options are a feature of all new Glow-worm boilers, allowing greater flexibility in installation.