Gas Condensing Water Heaters

Cannon’s flexible design Feedwater Heater can easily be used as a gas condensing water heater.


What is the difference between a regular economizer and a condensing economizer? The difference is the temperature range in which the economizer is operated. Our water heater units may look identical in outward appearance, but can be used in a condensing application if originally design to do so. A traditional economizer is operated in a hot environment, the tubes and the flue gases are over 200°F. A condensing economizer water heater operates in a cool environment, where the tubes and flue gasses may be well under 150°F. A large savings increase occurs when the flue gas temperature is decreased to under 135°F, but this is only effective when burning natural gas. Potential corrosion of the stack downstream can be addressed by upgrading the materials of the stack.

To get the best heat recovery, entering water temperatures should be in the range of 40F to 100F. This captures the most latent heat from the flue, and therefore the provides best Return on Investment

All CBW condensing water heaters feature stainless steel construction, the norm for this application, and we have several grades of stainless to choose from for many of the components in the unit.

Flue baffles and water drains are included to remove water condensed from the flue gas. This water is normally sent floor drains, but can be treated and reused (with extra equipment).

Gas Condensing Water Heater Prospect Qualification Criteria:

  • Natural gas, #2 oil, propane, methane (cleaned land fill gas) burning system
  • 50 – 3,000 HP boilers
  • Operating water/steam pressure greater than 15 psi, 900psig max
  • Can flow boiler or non-boiler water streams
  • Flue gas pressures in a range of 0.25 inches WC to 6 inches WC
  • Inlet water temperature of 40F to 100F
  • Flue gas temperatures to 700F




For More information on Gas Condensing Water Heaters call 724.335.8541 or click here to contact us.

Condensing Economizer Contact Form