Water heater thermal efficiency represents the potential percentage of energy an appliance can move from itself into a given system while operating. Energy factor ratings tell a different tale ...

We finished last month's column on life cycle costs for water heating with a 50-gal. propane tank-type water heater (July, pg. 32). The reason behind this discussion is to explain why it made sense ...

This brief presentation of the principles of life-cycle cost analysis is intended as background for the committee's report. Readers seeking a complete discussion of the topic should refer to the ...