Heatsponge manufacturers three types of rectangular units: the BOSS Unit, the SUPER Recovery Unit, and the the TITAN for lvery large boiler applications. These units feature identical construction with the only difference being the arrangement of the tubes inside of the unit. The BOSS unit features a longer effective length tube circuit with fewer rows in depth. The SUPER Recovery unit features a shorter effective length and increased tube depth. This requires more tubes in unit width to maintain the same gas side pressure drop across the bundle. The end result is more tubes, therefore more heating surface in the SUPER unit. The TITAN utilizes a double-tube element per circuit to accomodate large gas and water flow rates without excessive pressure loss.

All Heatsponge BOSS, SUPER, and TITAN Economizers Feature As A Standard:

• Computerized rating performance
• ASME Section VIII Construction Standard (Section I available contact us)
• 600 psig design pressure at 700 deg F design temperature
  - 600 psig design pressure at 600 deg F design temperature for duplex applications
• One-piece casing construction provides strength and easy installation
• Integral inlet and outlet transition pieces
• Integrated stack adapter flanges included as a standard
• Individually removable finned tube elements
  • Unit utilizes a true square-pitch tube arrangement and not a triangular, staggered, or coiled arrangement
  • SA-178-A/SA-214 carbon steel tube with carbon steel fin for deaerated water application
  • Type 304 Stainless steel tubes with stainless steel fins for cold water or non-deaerated water applications
    - We reserve the right to upgrade to 316 stainless steel tubes at no change in price based on material availability
  • Type 2205 Duplex stainless with stainless steel fins for cold water or non-deaerated water applications
  • All units feature 0.75" OD tubing, 0.049 ave wall for carbon steel, 0.049 ave wall for stainless
  • Fin pitch either 4 or 5 per inch, 0.040" thick, 0.500" tall
    - 5 fins for gas firing with #2 oil firing less than one week per year
    - 4 fins for consistent #2 oil firing - 3 fins for #6 oil firing
  • All units utilize compression fittings to connect tubes to headers
  • The fittings are threaded into the headers so there are NO ASME PRESSURE PART WELDS in our system
• Insulated, bolted removable rear door
  - Simply unbolt the rear door with the boiler offline and use a hose for quick and easy periodic cleaning
• Outer casing fully insulated with 2 inches mineral wool insulation
• Units provided with outer lagging factory installed
• Headers factory threaded
• Unit is 100% drainable by gravity in either vertical or horizontal installation
• Supply of an ASME Safety Relief Valve set at 250 psig as standard (other pressures may incur price change)

For smaller boilers around 300 HP or smaller HeatSponge offers the no-frills but very high quality SHORTY coiled-tube economizer. This unit utilizes a stainless steel tube in a stainless steel casing. It does not offer any of the same features as the rectangular model economizers. This unit was developed to offer a quality constructed heat recovery option to small boiler applications that cannot bear the cost of a larger rectangular economizer.

The Heatsponge SHORTY Model Economizers Feature As A Standard:

• Computerized rating performance
• ASME Section VIII Construction Standard (Section I available contact us)
• 450 psig design pressure at 600 deg F design temperature
• One-piece casing construction provides strength and easy installation
• Integral inlet and outlet transition pieces
• Integrated stack adapter flanges included as a standard
• Type 304 Stainless steel tube with stainless steel fins
  - We reserve the right to upgrade to 316 stainless steel tubes at no change in price based on material availability
  • 0.75" OD tubing, 0.049 ave wall
  • Fin pitch of 5 per inch, 0.040" thick, 0.500" tall
    
  • 3/4 tube ends provided for connection into piping
• Outer casing fully insulated with 1 inch mineral wool insulation
• Units provided with outer lagging factory installed
• Unit is 100% drainable by gravity in vertical installation
• Supply of an ASME Safety Relief Valve set at 250 psig as standard (other pressures may incur price change)

HeatSponge On-Line Rating program: The AutoPick software is based on the industry-standard Escoa approach to heat transfer. An industry standard, this proven and publicly available series of heat transfer equations can be relied on for providing accurate and consistent heat transfer ratings. All units that are awarded are further reviewed on a third-party software to insure accuracy with the preliminary online performance.