Enter the data for your specific application below. The areas where data input is required is identified as Required Data. Optional data such as the use of a water flow that is not boiler feedwater is identified by Optional Input. Information that is project-specific such as the boiler manufacturer and type or flue gas recirculation (if applicable) is identified as Project Specific Input.

Required Data: this data is required to make a preliminary selection.

HP PPH Enter Boiler Capacity: Required Data
You may enter your boiler capacity in either Boiler Horse Power (HP) or Boiler Pounds per Hour (PPH) capacity. Firetube boilers are typically rated in HP while watertube boilers are rated in PPH.

Economizer Inlet Water Temperature F: Required Data
Water inlet temperatures under 215 F will be considered non-deaerated - stainless steel tube required and will be included. Note if the economizer is to be used for a process water (non boiler feedwater) application you will have the opportunity below to enter a custom water flow rate.

Economizer Flue Gas Inlet Temperature F: Required Data
If you're not sure:
Firetube: If unknown assume 75 degrees above saturated steam temperature
Watertube: If unknown assume 150 degrees above saturated steam temperature
Click here for steam tables to see saturated steam temperatures

Boiler Type the Economizer Will Be Installed On: Required Data
Firetube Boiler
Flex-tube Watertube Boiler
Industrial Watertube Boiler
This is very important as firetube boilers typically require a lower draft loss across the tube bundle than an industrial watertube boiler. The AutoPick program needs to know what type of stack draft loss to select the unit for. All heatSponge economizers are designed for boilers withe forced draft blowers only. If you are an experienced boiler technician and understand the unique draft requirements of your boiler you may select an alternative maximum draft loss below.

Project Specific Input: Entered on a project-by-project basis.

Boiler Manufacturer Economizer Will Be Installed On: Project Specific Input
Select Manufacturer --- Firetubes (Scotch Marine) --- Burnham Columbia Continental Cleaver-Brooks Cleaver-Brooks LE Cyclotherm Donlee Eclipse English Boiler Hurst Industrial Johnston Kewanee Myrggo North American Sellers Superior Triad Boiler Systems York-Shipley Unlisted Firetube --- Flextube Watertubes --- Bryan English BTBF Unilux Flextube Universal Boiler Works Unlisted Flextube --- Industrial Watertubes (D-A-O-S Types) --- ABCO Aalborg B & W Bigelo Cleaver-Brooks D-Type Clayton Combustion Engineering English Boiler Erie City Foster Wheeler Fulton Indeck-Keystone Keeler Murry Trane Nebraska Rentech Unilux Union Iron Works Vapower Victory Energy Volcano Zurn Unlisted Industrial Watertube
We recommend you enter the manufacturer of the boiler if known as some boilers, primarily firetube boilers, have a lower tolerance for flue gas backpressure. Not selecting any specific manufacturer will result in the use of default data for the boiler type selected.

Burner Flue Gas Recirculation Rate: Project Specific Input
Enter the FGR rate only if your burner utilizes FGR. If your burner does not use any FGR then leave this cell blank. Typical Low NOx burners run 5% to 15%. Standard burners have no FGR so leave cell blank.

Enter Blowdown Rate (%): 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Project Specific Input
This is the percent continuous (surface) blowdown. Enter if known.

Enter Fuel Price ($/mbtu): 8.00 8.25 8.50 8.75 9.00 9.25 9.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50 11.75 12.00 12.25 12.50 12.75 13.00 13.25 13.50 13.75 14.00 14.25 14.50 14.75 15.00 15.25 15.50 15.75 16.00 16.25 16.50 16.75 16.00 16.25 16.50 16.75 17.00 17.25 17.50 17.75 18.00 18.25 18.50 18.75 19.00 19.25 19.50 19.75 20.00 20.25 20.50 20.75 21.00 21.25 21.50 21.75 22.00 22.25 22.50 22.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75 Project Specific Input
Select the price of natural gas in dollars per million btu's.

Enter Annual hours of Operation: Project Specific Input
There are a total of 8,760 hours in one year
8750 1 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 At 100% Firing
1 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 At 75% Firing
1 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 At 50% Firing
1 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 At 25% Firing
These hours will be reflected in each of the four load performance runs

Optional Input

PPH GPM % Make-Up Custom Water Flow Rate (lbs/hr): Optional Input
Enter the water flow rate ONLY if the flow rate will differ from the boiler capacity flow rate. This feature is for economizers used in a non-traditional installation such as process water heating. If your application is a typical boiler economizer arrangment then leave this cell blank and leave units on PPH!

• PPH - Enter an exact value in pounds per hour (PPH) non-deaerated water flow through the economizer
• GPM - Enter an exact value in gallons per minute (GPM) non-deaerated water flow through the economizer
• % of Make-Up - enter as a percentage number between 25 and 100 when using cold non-deaerated water prior to delivery to feedwater tank. Not valid for dearated water flow to boiler.

Unit Recovery Type - BASE, HIGH, COIL: Optional Input
BASE - Base Unit - Lowest Capital Cost HeatSponge
HIGH - High Recovery Unit - Higher Capital Cost HeatSponge
COIL - Economy Coiled Unit - Typically under 150 HP Only

This is the users opportunity to select a unit configuration based on desired recovery and capital expense. The AutoPick software is designed to automatically switch to a HIGH unit from a BASE unit if the energy recovery is higher and there is no difference in price from the BASE model. We recommend looking at both a BASE and a HIGH unit and comparing the additional recovery and unit cost to make the most economical purchase decision.

The COIL economy coiled economizer does not have any of the HeatSponge features as is a lowest dollar unit for very small applications. If the COIL unit is selected for a boiler too large the software will automatically switch to a BASE unit and activate the AutoPick software.

End of required and optional data requirements for typical HeatSponge Applications.