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Storage up to 50 Litres

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Unvented 'mains pressure' units below 50L capacity are electrically heated and operate at the same mains pressure as the incoming cold water supply (typically 3 bar or so) and therefore provide excellent hot water flow rates. They may be used to supply more than one outlet using conventional taps but may require additional accessories depending on the installation. Unvented storage heaters above 15L capacity are supplied with accessories. Vented water heaters do not store hot water at mains pressure, but operate instead by using vented (non-standard) taps to control the flow of cold water into the unit which displaces hot water out of the unit through the tap. These units can only supply a single outlet, and expansion of hot water can result in dripping from the hot tap when water is heated. 

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