View Sources Source(s) or Contributor(s) DOE - Heat Pump Water Heaters DOE - Estimating Costs and Efficiency of Storage, Demand, and Heat Pump Water Heaters DOE - New Infographic and Projects to Keep Your Energy Bills Out of Hot Water DOE - Sizing a New Water Heater DOE - Selecting a New Water Heater Attachment(s) Introduction to Heat Pump Water Heaters - Presentation.pptx Presentation on the educational content found in introduction to heat pump water heater lecture and training module.