Flameless Air, Indirect Fired and Hydronic Heaters from 210,000 to 4,200,000 BTUs

Flameless Air, Indirect Fired and Hydronic Heaters from 210,000 to 4,200,000 BTUs

Designed to optimally perform in the most extreme cold weather environments, our flameless, hydronic, and indirect fired heaters can be trusted to keep your worksite warm and operational.

We work hard to provide you with dependable, heavy-duty options that can be used in places where an open flame could pose a potential hazard. Protective alarms and innovative mechanisms also help to ensure the safe operation of each unit. If you're searching for a secure heating solution for your desired location, look for no other name than Generac|MAC.

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Products - Heaters

Heater Type

Heat (BTUs)

MAC550F Flameless Air Heater

This flame-free heater provides a temperature rise of up to 180°F through two 12" outlets.

  • BTU: 450,000*
  • CFM: 1,400 - 3,500
  • Static Pressure: 5 in.

MAC750F Flameless Air Heater

This flameless heater featuring an air output volume of 2,650-5,500 CFM at 5" static pressure.

  • BTU: 550,000*
  • CFM: 2,650 - 5,500
  • Static Pressure: 5 in.

MAC950F Flameless Air Heater

Powered by diesel fuel, this flameless heater provides heat from long distances.

  • BTU: 1,000,000*
  • CFM: 3,000 - 6,000
  • Static Pressure: 5 in.

MAC400G Indirect Fired Heater

Operating on diesel fuel, this small size indirect fired heater can cover up to 1,700 CFM.

  • BTU: 400,000
  • CFM: 1,700
  • Static Pressure: 3 in.

MAC800G Indirect Fired Heater

Use this indirect heater's single axle trailer to provide diesel powered heat at heavy-duty construction sites.

  • BTU: 800,000
  • CFM: 3,900
  • Static Pressure: 3 in.

MAC1.2G Indirect Fired Heater

Provide clean, safe and reliable air flow from long distances with this diesel-powered indirect heater.

  • BTU: 1,200,000
  • CFM: 6,500
  • Static Pressure: 3 in.

MAC2.5ES Indirect Fired Heater

Provide heat at 12,000 cubic feet per minute through this indirect heater's 30" outlet.

  • BTU: 2,500,000
  • CFM: 12,000
  • Static Pressure: 3 in.

MAC4.2 Indirect Fired Heater

This indirect diesel fired heater provides heat to larger areas without compromising performance or safety.

  • BTU: 4,200,000
  • CFM: 21,000
  • Static Pressure: 3 in.

MAC6000 Hydronic Surface Heater

Use up to six 500-foot hoses to maximize coverage options with this Hydronic Surface Heater.

  • BTU: 630,000
  • Hose Length: 3,000 ft. (6 x 500 ft.)
  • Fuel Capacity: 225 gal.

MAC210HC Indirect Fired Heater (Airline)

The MAC210HC is an ideal airport heating solution, as it features an air output volume of 1,100 CFM.

  • BTU: 210,000
  • CFM: 1,100
  • Static Pressure: 2.1 in.

MAC400HC Indirect Fired Heater (Airline)

Ideal for airline use, this indirect fired heater provides 400,000 btu at 9" static pressure.

  • BTU: 400,000
  • CFM: 3,600
  • Static Pressure: 9 in.

MAC400FHC Flameless Air Heater (Airline)

This flameless air heater is a compact airport solution that safely operates on #1 or #2 diesel fuel.

  • BTU: 450,000*
  • CFM: 3,600
  • Static Pressure: 9 in.