WattWise: Water Heating
- Consumer Guide to Home Energy Savings: Condensed Online Version describes five types of water heating systems and offers advice on the selection of a water heater.
- Electric water heating (pdf) is described with suggestions on how to select the best water heater.
- Heat Pump (pdf) offers a definition of heat pump water heaters for residential use and performance/cost data as well as related websites.
- Tankless (Instantaneous Water Heaters) explains the tankless technology, special features, and precautions.