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Unvented Direct

 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. They come into their own when a gas/oil boiler is either not available or too expensive to install, or in situations where the requirement for annual gas safety checks of appliances, flues and pipework is considered onerous, for example at rental properties. They are also suitable for a wide range of commercial applications such as hair dressing salons, canteens, washroom areas etc. Reheat calculator   

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