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Any hot water system must be able to meet the requirements of the whole house. That is all sanitary units and whatever appliances are connected e.g. dishwashers, washing machines etc. Bathing tends to create the largest demand for hot water; each bath will require approximately 65 litres of hot water. The size of the property and layout of the rooms that have sanitary fittings also needs consideration. Long pipe runs supplying hot water would probably be un-acceptable for centralized instantaneous heater systems, and a combination of systems may be more appropriate.
This section aims to examine the two main types of water heating and their derivatives, giving a simplistic overview of each system so that the reader can gain a holistic view of the choices that are available.
The key issue is to specify and install a system that is best matched to your individual needs and circumstances at a cost that you can afford. However care needs to be taken to ensure that the system installed does not adversely affect the value of your property. When purchasing a system the specifier needs to consider the type of property i.e. public building, rented accommodation, personal home dwelling and the long term plans for occupancy i.e. investment property or life long home.