- Once-Through Heater (OTH)



The VariMax™ OTH (Once-Through Heater) is a high efficiency, industrial, indirect-fired gas heater used to heat process air streams without contaminating the air with the products of combustion. The OTH is well-suited for recirculating ovens, dryers, makeup-air applications in cold environments, and industrial processes with moderate temperature rises. The counterflow configuration, four-pass design and optimized, secondary, tubular heat-exchanger result in efficiencies up to 88%.

The heater uses a Maxon® industrial gas burner for clean, reliable combustion. The OTH can handle airflows from 2000 to 65,000 SCFM, produce air temperature rises from 20°F to 150°F, with a maximum outlet temperature of 600°F, and are constructed of heavy-duty, stainless-steel for strength, durability and corrosion-resistance.

  • 80% min effectiveness
  • Up to 150°F rise
  • Up to 600°F discharge
  • Flanged for duct mounting
  • Optional gas train & control packages
  • Complete heater box supply
  • Complete heating packages available, including filters, dampers, fans and duct sections
  • Available in 6 pre-designed sizes: 500 MBTU - 3,500 MBTU
  • Designed to use on Maxon OvenPak burners
  • .2% maximum leakage

  • Stainless steel casing
  • Burners (oil / gas)
  • Centrifugal fan
  • Stainless steel sheet metal casing
  • Insulation
  • Dampers
  • Indirect-fired gas heat
  • High efficiency air filters
  • Gas, electric, hot water, steam, heat
  • Multi-fuel burners
  • Low-NOx burner

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