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American Council for an Energy Efficient Economy (ACEEE)
ACEEE publishes the Consumer Guide to Home Energy Savings. Their website has a link to a listing of the most energy-efficient appliances available.

Minnesota Department of Commerce

• Energy Information Center, Home Energy Guides
  Minnesota's Department of Commerce provides practical information for homeowners who are interested in improving the energy efficiency and safety of their homes, saving money, and protecting the environment. Their guide on water heaters covers buying, sizing, purchasing, and installing a water heater system, and how to avoid waste in using hot water. The guides are available through the Energy Information Center and are available by mail, by calling 1-800-657-3710 to request a publication, on CD-ROM, or online.

United States Department of Energy
The Department of Energy has several websites where consumers can find information on energy efficiency and renewable energy technologies.

• Energy Efficiency and Renewable Energy Network
  This site features a reference brief on "Demand (also known as Tankless or Instantaneous) Water Heaters" as well as information on "Energy-Efficient Water Heating," and "Selecting a New Water Heater."
• Office of Building Technology, State and Community Programs
  Online information on saving water and heating it efficiently, choosing a water heater, reducing your water heater's energy use, and reducing your usage is available on this site.
• Office of Codes and Standards
  DOE's Office of Codes and Standards is responsible for establishing the national efficiency standards for home appliances and equipment. Their site has information on purchasing energy-efficient appliances (including water heaters) and information on reading the EnergyGuide label found on appliances and information on building codes.