Self-Contained Mobile Industrial Heater


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 output390,000 BTU/hr
BurnerRiello 40 F10
Heat exchange material304 Stainless
Fan motor3/4 hp, 120V
Fan capacity2500CFM @ 1/2 in wgOptional 2800CFM @ 2.0 in wg
Duct outletsDual 12 in
EngineKubota D1005
GeneratorMecc Alte
Engine continuous power6 kW
Main breaker rating40A
Auxillary power receptacle20A, 120V, 60Hz
Fuel storage
Capacity82 gal [424L]
Seconday containment200%
Fuel type
Heater burn rate
Rate3.25 gph [12.3 lph] max
Trailer shipping W x L x H80 x 137 5/8 x 85 3/4 in
Air cargo shipping W x L x H60 x 92 x 60 in
Dry with trailer2322 lb
Wet with trailer2930 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…

Product Support Page

Model #






Highlight Specs

Max BTU Output: 390,000 BTU/hr
Max Air Flow: 2,500 CFM
Fuel Tank Size: 80 Gal
Fuel Type: Diesel
Max Fuel Consumption: 3.25 GPH
Run Time: 24 hrs +
Oil Service Interval: 200 hrs
Generator: 6KW