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Unvented hot water cylinders are now the most popular option for new hot water systems and operate at the same mains pressure as the incoming cold water supply (typically 3 bar or so) and therefore provide excellent water flow rates without requiring an header tank in the loft space or additional pumps. In 'direct' units the water is heated by one or more electric immersion heaters, whereas a gas/oil boiler is required for an indirect unit.   

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