Comparing Measured Consumption with Modelled Consumption Using the Code for Sustainable Homes (2009)

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This investigation was undertaken by Portsmouth Water to assess how water-efficient fittings can reduce water demand in new homes. However, no water-saving devices were installed by the developer as planned, which is why only water consumption patterns were assessed. The sample of 60 homes with a mean occupancy of 2.17 people consumed on average 125.9 litres/household/day. Consumption was lower in the shared than in private ownership properties, despite having very similar water fittings. A 6/4 L dual flush toilet was seen to be relatively ineffective at driving down demand compared to a 6 L single flush option.