"Donna Ohl, Grady Volunteer Coordinator" wrote in
message ...
On Sun, 10 Feb 2008 23:10:47 -0500, mc wrote:

Or does the 50 gallon water heater actually cost more
even if it's the same efficiency factor?

Heating less water costs less, even with equally efficient heaters.

Are you sure?

Look at what this energy page says about the Efficiency Factor:
http://www.friendlyplumber.com/plumb...er_energy.html

The "energy factor [is the] number of cycles that can be completed w/ one
kilowatt-hour of electricity".

If that's true, then it's independent of the VOLUME of the water heater.

Strange. Then it isn't a measure of efficiency.