• ES500 indirect fired heater
  • ES500 indirect fired heater
  • ES500 indirect fired heater
  • ES500 indirect fired heater control panel
  • ES500 indirect fired heater Flagro 400 burner
  • ES500 indirect fired heater 3-light beacon
  • ES500 indirect fired heater outlet duct clamp
  • ES500 indirect fired heater LED floodlight


Heat:  390,000 BTU/hr

Airflow:  2500 CFM

Capacity:  82 gal

Burn rate:  3.25 gph


The compact, yet powerful ES500 indirect fired air heater outputs 390,000 BTU/hr at up to 2500 CFM. It is diesel powered and operates for 25 hours between refuels.

At the heart of this portable heating unit is a Flagro 400 indirect fired heater powered by a Kubota engine with a Mecc Alte generator end. These main components are housed in a durable steel cabinet designed with safety and convenience in mind. The cabinet features include 200% secondary fluid containment, emergency shutdown switch, seven bright LED floodlights, and easy access to commonly serviced components. The heater is light-weight and mounted on a 3500 lb single-axle trailer for easy mobility.

The ES500 industrial heater is engineered for reliable performance in extremely low temperatures and proven on Alaska's North Slope oil fields and in northern Canada.

See for yourself how ESI heaters are the best heating solution for oilfield, construction, and agriculture worksites. Get one today!

Features & benefits

  • 390,000 BTU with up to 2500 CFM
  • 25 hour run time
  • Kubota engine with Mecc Alte generator end
  • Flagro FVO-400 heater with Riello 40 burner
  • Three-color beacon light indicates engine, burner, fuel status
  • Seven bright 18W (1260 lumens) LED exterior floodlights
  • Interior and control panel lights
  • 120V GFCI power outlet
  • Emergency shutdown switch
  • Forklift pockets  
  • Light 2332 lb dry, 2930 lb wet
  • Input jack for optional remote thermostat

Quality construction

  • 100% 304 stainless steel fire tube & heat exchanger for quality that is second to none
  • Environmentally responsible construction that features 200% secondary fluid containment

Easy service by design

  • Easy access engine compartment facilitates ease of service functions
  • Standard industrial components ensure widespread parts availability

Available mounting

  • Trailer mounted on 3,500 lb axle


  • Remote thermostat to adjust heater output




Max burner output

390,000 BTU/hr

Burner Riello 40 F10
Heat exchange material 304 Stainless
Fan motor 3/4 hp, 120V

Fan capacity

2500CFM @ 1/2 in wg

Optional 2800CFM @ 2.0 in wg

Duct outlets

Dual 12 in



Kubota D1005

Generator Mecc Alte
Engine continuous power 6 kW
Main breaker rating 40A
Voltage 120V

Auxillary power receptacle

20A, 120V, 60Hz

Fuel storage


82 gal [424L]

Seconday containment


Fuel type



Heater burn rate


3.25 gph [12.3 lph] max


Trailer shipping W x L x H

80 x 137 5/8 x 85 3/4 in

Air cargo shipping W x L x H

60 x 92 x 60 in


Dry with trailer

2322 lb

Wet with trailer

2930 lb


Heater ducting

  • Jetflex by Engineered Performance Ducting
  • ES500 outlet: 2 x 12", 1 x 16", 1 x 20" diameter
  • ES500 inlet: 1 x 20" diameter
  • Available in 25 foot length

More info...