| Glow-worm's Advanced system store - the most efficient boiler in the UK as rated by SEDBUK. Glow-worm Ultrapower sxi is designed for the larger property, it provides endless hot water on demand through an innovative storage system with fast reheat times and combi back-up, all within a single appliance that fits in an airing cupboard. The innovative shift load storage system of the Ultrapower sxi generates hot water whenever a tap is turned on and by drawing on the internal storage system at the same time it can rapidly deliver up to 170 litres of hot water. Important, Flue Kit and Timer not included unless otherwise stated.
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