- In (drinking) water: the volume of water consumed is strongly influenced by the behaviour of the users. According to the magazine Plein soleil / C.N.R.S-EcoDev, in France, a standard type 4 dwelling (three bedrooms) uses 100 to 150 litres of hot water (at 60 [°C]) per day. However, there is a constant increase in the need for water, especially hot water, in the order of 3 to 4% per year (Gaz de France survey).
- In energy: the heating of domestic water accounts for nearly 20% of final energy consumption in the residential sector (according to the Observatoire de l'énergie).
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