| 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. Key Features •SEDBUK A •NOx Class 5 •5 Second hot water delivery * •Advanced Diagnostics •LPG compatible without conversion kit •Back-lit digital display •Back up immersion heater •Optional pre-fixing jig •Inbuilt frost protection •Continua electronics •Inbuilt programmer
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