We take a look at the key differences between open vented systems and sealed systems to help you decide what is best for your commercial heating refurbishment project. It is possible to use a mains fed pressurised hot water cylinder with an expansion vessel but there seems little point. Nb not to be confused with vented and unvented hot water tanks which are explained in our guide to hot water cylinders many homes in the uk still have an open vented heating system and in some cases they are the better option for your home. 
				
			
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