Commercial Products  >  Economizers & Heat Exchangers
Economizer - Double Row

When properly implemented, the double-row ENERVEX Flue Gas Economizer VHX-DR can help you conserve energy and save 10+% on fuel annually.

This is a highly versatile and efficient flue gas economizer for single OR multiple boilers of atmospheric, fan-assisted, or forced-draft design. Its fully packaged, lightweight, round configuration, integrated modulating bypass, and efficient hybrid microchannel/plate heat exchanger allows extremely high heat transfer capability and low flow resistance.


  • Use with ANY boiler type, baking oven, process oven and more
  • Vertical or horizontal installations
  • 316L stainless steel housing and heat exchanger
  • Non-condensing & condensing applications with no modification
  • Compact and lightweight to save space
  • Heat Modules can act as individual liquid circuits
  • Highly configurable
  • Integrated bypass eliminates overheating of heat exchanger
  • Integrated flexible tube connections
  • Also available in 2-stage version - VHX-DRS

Input Form: Process Air Application  Input Form: Boiler Application


Models Available 7 (2 to 10 Heat Modules)
Housing Material Stainless Steel 316L
Heat Exchanger Material Stainless Steel 316L
Heat Exchanger Hybrid Micro-channel/Plate Heat Exchanger Assymetric Volume Flow Type
Max Operating Pressure 230 PSI
Water Connecetions G1.25 NPT
Max Air Temperature Limited by Max Plate Temperature of 375°F (190°C)
Max Fluid Temperature -256°F to 375°F (-160° to 190°C)
By-pass Modulating Multi-blade Inlet Damper
Power Supply 24 VAC/VDC
Control Signal 0-10VDC
Warranty 2-year Factory Warranty
VHX Economizer Double Row—two-stage flue gas economizer
HMM Heat-Module Manifold—used alongside economizers to connect the heating on the supply and return sides
Heat-Module Manifold

The HMM heat-module manifolds are used in conjunction with the VHX Economizers. They are used to connect the heating on the supply and return sides.

IPVB-EC Inline Power Venter—for undersized chimney systems with draft problems
Inline Power Venter

A mid-range high-temperature mechanical draft fan designed for inline mounting. For vertical or horizontal installation. Used with condensing or non-condensing heating appliances.

HRC80 Economizer Controller—monitors inlet/outlet water and flue temperatures
Economizer Controller

A totally integrated heat recovery control system that monitors inlet and outlet water and flue gas temperatures to maintain the outlet water temperature you need, while maximizing heat waste recovery and efficiency.

EBC 31 Modulating Pressure Controller—multi-use draft and pressure controller with integrated web server and remote access
Modulating Pressure Controller

A sophisticated multi-use draft and pressure controller with integrated webserver and remote access used with fans and dampers to monitor and maintain a constant pressure in commercial boiler and building applications.