water heating accounts for about 14 percent of the average U.S. household energy budget (http://www.toolbase.org/tertiaryT.asp?CategoryID=1402&DocumentID=2138)

Related References

-------- Buildings: one wall centre mechanical and electrical systems, by Heffernan, V., 2001 -------- Electrical and thermal characterization of a PV-CPC hybrid, by Nilsson, J., H?kansson, H. and Karlsson, B., 2007 -------- Industrializing the residential construction site, by Center for Housing Research at Virginia Polytechnic, 2000 -------- Towards a design environment for buildingintegrated energy systems: the integration of electrical power flow modelling with building simulation, by Kelly, N.J., 1998