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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.
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.
A full central heating system is often perceived to add value to a property irrespective of age, yet in a small one bedroom or partially used property instantaneous heaters may be more appropriate. A balance therefore, needs to be obtained, between installation cost, intended usage and investment criteria.