The vast majority of domestic hot water
heaters — 90 percent — use natural gas or electricity
for their heat source, with the remaining
10 percent split among oil, LP gas, wood and
solar power.
Most of the solar heaters are used by people
in Florida and the Southwest, while wood
heaters are used by old-timers and die-hard
"back to the earth" types. LP gas is found in
remote areas where people are concerned about
their electric costs, and oil is used most often
in commercial applications and by
homeowners who use the fuel for space heat as
well.
Not surprisingly, most of the electric heaters
are found in the Pacific Northwest and in the
Tennessee