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 provides tips on sizing a solar hot water system according to your hot water needs.


  • Collector sizing and roof space
  • OG-100 directory
  • OG-300 directory
  • Solar energy factor (SEF)
  • Solar fraction (SF)
  • Solar Rating and Certification Corportion (SRCC)
  • Solar storage tank sizing
  • System efficiency


  • 2