Editor’s note
The following abstract describes a publication that is only available as a downloadable PDF.

CoverDeveloped by Montana State University Extension and the University of Wyoming
Adapted with permission

This guide is one in the Exploring Energy Efficiency and Alternatives (E3A): Solar Hot Water Applications for the Home, Farm or Ranch series. This one is a worksheet to aid you in determining the appropriate size of solar water heating system for your home.


  • Average daily solar energy (radiation)
  • Btu per square feet per day (Btu/ft2/day)
  • Collector category
  • Collector quantity
  • Collector type
  • Daily hot water use
  • Energy needed to heat your water
  • Sky type
  • Solar Rating and Certification Corporation (SRCC) tested and rated collectors


  • 4