Flight Line Heater


Reliable preflight heat meets ESI innovation and durability on the tarmac with the ES300-GSE mobile flight-line heater.

Working closely with small and large aircraft operations in Alaska, ESI developed a product that meets their needs: a reliable and economical ground support heater that stands up to the harshest of arctic tough conditions.

Built on proven firebox technology by Flagro, the ES300-GSE heater is a portable heating system that’s tightly aligned with the demands of preflight heat on the tarmac. Three 6-inch outlet ducts evenly distribute heat to multiple points on the aircraft. The Riello burner runs on jet fuel or diesel, and the built-in 23-gallon fuel tank is equipped with a 3-inch fuel spout to accommodate avgas nozzles for convenient re-fueling anywhere on the tarmac. Large, heavy-duty wheels and an integrated hose rack increase mobility, allowing one person to easily transport the ES300-GSE across the tarmac in all weather conditions.

Features and Benefits

  • Powerful 200,000 BTU/hr heat output
  • Convenient built-in 23 gallon fuel tank
  • Upgraded 1.5 HP fan motor with variable pitch fan
  • Three 6-inch duct outlets utilize an innovative cone design to evenly distribute heat, reducing hotspots
  • 3-inch fuel spout accommodates jet fuel nozzles allowing for a single fuel source on the tarmac
  • Large, heavy-duty wheels with flat-free tires for easy one-person transport across the tarmac in all weather conditions
  • Integrated hose rack simplifies transport, increasing mobility

Easy Service by Design

  • Easy access fan and burner facilitates ease of service functions
  • Common “off the shelf” components ensure widespread parts availability


  • Remote thermostat (plug and play)
  • Variable temp burner jets to dial in heat output


Output200,000 BTU/hr
Airflow1500 CFM
Burn rate1.4 gph
BurnerRiello 40 F10
Heat exchanger material304 Stainless steel
Fan motor1.5 HP, 120V
Power requirements20A, 120V, 60Hz
15A, 120V, 60Hz available upon request
Outlet ductsThree 6-inch
Fuel typeULSD / Jet Fuel
Capacity23 gal
Height43 1/2″
Weight (dry)350 lb
Weight (wet)513 lb


Heater ducting

  • Jetflex by Engineered Performance Ducting
  • ES300-GSE outlet: 3 x 6″ diameter
  • Available in 25 foot length

More info…

Model #






Highlight Specs

Max BTU Output: 200,000 BTU/hr
Max Air Flow: 2,000 CFM
Fuel Tank Size: 23 Gal
Fuel Type: Diesel
Max Fuel Consumption: 1.5 GPH
Run Time: 15 hrs +