On Mon 11 Feb 2008 15:28:47, Donna Ohl, Grady Volunteer Coordinator
wrote:

On Mon, 11 Feb 2008 08:17:59 -0800 (PST), wrote:

http://www.ho****er.com/products/residential/gas.html

We're getting closer!


It sounds like you are setting up something in your posting so that
others are invited to take part.


The nice thing about the site you recommended is it contains a
freeware payback calculator which we were missing up until now!
http://www.ho****er.com/products/payback.aspx

You guessed right the first time ~ it's not really freeware.


You enter in the cost per therm (e.g., $1.33/therm) and the gallons
per day and then it compares two models, given their cost, to
calculate how long the payback period is for the more expensive
one.

The only thing missing from this free payback calculator is the FHR
and ER calculations which it assumes because it only allows its
models to be compared.

Does anyone know of a freely available payback calculator that
allows all brands to be analyzed (i.e., it takes into account the
FHR and ER ratings which all water heaters must provide)?

We'd all benefit from your advice,
Donna

Donna, is there a freeware engineering tool for designing domestic hot
water heaters. Maybe there is one which links into a suppliers a bill
of material parts systems or their inventory system. That would be
useful for all of us.

Can you help us?