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Generac Mobile Products

MAC400G Indirect Fired Heater

generac mac400g mobile indirect fired heater

The MAC400G Indirect Fired Heater offers the high level of efficiency and reliability that you expect from a Generac in a small, portable body. This indirect diesel fired heater provides heat that is cleaner and safer than direct fired heaters and can operate in smaller spaces, making it perfect for use in construction areas, medium structure heating, concrete curing, equipment thawing, and moisture control.


  • 400,000 BTUs
  • Air output volume of 1,700 CFM, delivered through 1-12 inch outlet
  • Temperature rise of 180?
  • Static pressure: 3 inches
  • EPA Tier 4 Isuzu engine
  • 200 feet of duct length
  • 3.4 GPH normal operating fuel rate

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