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Boiler Exhaust - Rectangular Tube Recovery (RTR Series)

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Rectangular Tube Recovery (RTR Series)

The RTR is ideal for large steam boilers and hot water boilers. This Cain economizer is typically used to preheat boiler feedwater, process water, or cold inlet water condensing applications. The RTR is equipped with an internal exhaust gas bypass made of stainless steel that can be used to temper the exiting gas for stack corrosion control, or to maintain water temperatures when too much heat is available.

Optional stack transitions are available when the RTR connecting to a combustion sources with round exhausts. A variety of heat transfer surfaces are available, including: 316L stainless steel, carbon steel, duplex stainless steel, and the stainless steel tube with aluminum bonded AL-FUSE™.

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Combustion Capacity: 40,000 PPH ( 50,000,000 BTU/hr input approx.)

Entering Gas Temperatures: 300°F to 1250°F


  • No pressure welds in the gas stream
  • Internal thermal expansion design
  • 10 gauge structural exterior
  • Stainless steel interior
  • 2 inch factory insulation
  • Mounting flanges for bolting to mating flanges or adapters
  • Removable access door
  • Stainless steel internal bypass
  • Header manifold for high liquid flow
  • Compression fittings for tube replacement
  • Condensate drain catch ring assembly

Combustion Sources

  • Steam Boilers
  • Hot water boilers
  • Combustion sources generally having rectangular or square stacks
  • .

Heat Sink Types

  • Boiler feed water
  • Makeup water
  • Hot water return
  • Process water
  • Potable water
  • Thermal fluids
  • Run-around systems
Request a Quote for Boiler Economizers

The RFQ (Request for Quote) Options:

On-Line Form --- Complete on-line and Submit Print and Fax to 262-251-0118

Call 262-251-0051 ext:22 or email customer.support@cainind.com with any questions