A load research project by the Florida Power Corporation (FPC) is monitoring 204 residences in Central Florida, collecting detailed end-use load data. The monitoring is being performed to better estimate the impact of FPC\u27s load control program, as well as obtain improved appliance energy consumption indexes and load profiles. A portion of the monitoring measures water heater energy use and demand in each home on a 15-minute basis. The paper summarizes the various impacts identified on water heating energy use and demand