If virtually UNLIMITED hot water is what you want at great saving - the System 2000 is a great choice. *Based on fuel price of $2.29 per gallon and System typical fuel savings of 30%-40% or more. It's like saving 60 cents to $1.00 per gallon year after year! Season after season, whatever the weather, save up to 40% off heating costs.

http://www.system2000.com/savings