On Apr 8, 8:10*pm, Wayne Whitney wrote:
On 2008-04-08, wrote:

again please post a link that says 20% go up the chimney........
please a link....... please........ all i see is someone stating it
must be....

Take a look at http://www.aceee.org/consumerguide/waterheating.htm,
in particular the life-cycle costs comparison. *This shows a typical
gas tank water heater has an energy factor of 0.60, and a typical gas
tankless has an energy factor of 0.80. *The difference of 20%
represents the standby losses. *Prior computations suggest that of
those standby losses, 7% represents the loss through the tank
insulation, and 13% represents the loss through the gas flue.

Cheers, Wayne

Hey Hallerb, here it is, read and learn.