Residential water heating is typically the third largest energy use in the home and can account for nearly a quarter of overall hous ehold energy consumption. Home residents depend on a reliable and sufficient supply of hot water for multiple uses in the home , and they are increasingly aware of the energy implications of different hot water systems. This course will take a look at a st udy done on Energy, Environmental and Economic Analysis of Residential Water Heating Systems. This study provides an energy, envi ronmental, and economic analysis of 11 residential water heating systems in 10 geographic locations throughout the United States, with emphasis on the performance of propane-based systems relative to alternatives. The objective of the study is to compare the different perfor mance and economic characteristics of water heating systems to inform builder, contractor, and homeowner decision s on water-heater s election. This on-demand, online course is self-paced and features a pre-recorded narrative that servesa s the instructor. This allows learners to read along with the narrator and listen to the information; similar to typical live instru ction. After completing the course a 10-question quiz must be completed. At least 8 of 10 questions must be answered correctly to ea rn credit for the learning unit. Start-to-finish this course should take approximately 50 – 55 minutes to complete. Learners m ay wis h to spend additional time to review concepts prior to completing the quiz. A certificate of completion can be printed for self-repo rting and record-keeping needs.