Consumer's guide to solar hot water heaters — U.S. Department of Energy: www.eere.energy.gov/consumer/your_home/water_heating/index.cfm
FindSolar (estimate savings, find contractors): www.findsolar.com
Northwest Solar Center : www.northwestsolarcenter.org
Shoreline Solar Project : www.shorelinesolar.org
Solar Rating and Certification Corp. : www.solar-rating.org
Solar Washington : www.solarwashington.org
Seattle Times (March 5, 2006): Even with our clouds, solar water heaters are a viable option.