1. DOE, 2011 Buildings Energy Data Book, U.S. Department of Energy, 2011.
2. Energy Consumption in the UK, Department of Energy & Climate Change, London SW1A 2AW, 2014. .
3. Production efficiency of hot water for domestic use;Boait;Energy Build.,2012
4. Comparing domestic water heating technologies;Leidl;Technol. Soc.,2009
5. Drain water heat recovery;Cooperman;ASHRAE J.,2011