Infern-O-Therm Stack Economizer Savings Calculator

This calculator computes fuel savings and potential return on investment for an Infern-O-therm Stack Economizer retrofit kit for your direct contact water heating system. This unit, which uses flu exhaust gases to pre-heat incoming water, will fit most makes of direct-fired water heating tanks.

Assumptions:

1. Tank size = 15,000 gallons 2. Incoming water temperature = 50-55 degrees F. 3. Water flow rate = 47 GPM. 4. Stack temperature before retrofit = 465 degrees F. 5. Water temperature raised 32 degrees 6. Heating water for 10 hours a day, 5 days a week. Webmaster's note: An improved version of this calculator, with many more variables, is in the works as of 5/20/08. To be notified when the new calculator is posted here, click this link to email us: info@maconcrete.com.