Tank size is very important and cannot be completely disregarded since it
provides the reserve capacity. It is this the tank's storage capacity, in
conjunction with the burner size and the EF factor that determines the FHR
rating, which determines how much "hot" water you will get before it is
considered simply "warm" water. The storage capacity is also very important
in regards to determining the physical dimensions of the tank. (I has to
fit in the space allowed and the height and spacing of the exhaust flue,
water inlet, water outlet and gas inlet will be dependent on the tank's
size.)

I already posted my thoughts on warranty as well in a previous reply. The
bottom line here is you certainly know more than enough to make an informed
choice.

Bob



"Donna Ohl, Grady Volunteer Coordinator" wrote in
message ...
On Wed, 13 Feb 2008 05:34:49 -0800 (PST), wrote:
bottom line provided you buy a large enough heater the other
differences are minor,

Hi Hallerb,

I agree the whole point is to buy a "large enough heater"; the only thing
I'm saying about that is "large enough" has almost nothing directly to do
with tank size. Certainly it has nothing to do with warranty.
Donna