Thaw Boss


Meet the new standard in hydronic heat: Thaw Boss.

The ES3000 Thaw Boss combines innovative ESI design with a reliable Kubota engine and a powerful, efficient Buderus boiler. This winning combination results in a heavy-duty, Arctic Tough hydronic heating platform which exceeds the competition in heat output, fuel efficiency, and durability.

ESI’s mobile hydronic heater produces 334,000 BTU/hr of effective heat output with the capability to handle 5,000 square feet of ground thaw quickly. Four 750-foot hoses ensure maximum uniformity in the thaw field for even thawing and curing over large areas.

To keep fluid flowing in extremely cold temperatures, the Thaw Boss delivers a whopping 150 psi operating pressure. So, even at the coldest worksite in the heart of winter, you can count on the ultimate in ground thaw, curing, and general heating performance.

Features and Benefits

  • 334,000 BTU/hr heater output
  • 5,000 sq ft thaw field
  • 150 psi operating pressure keeps fluid flowing in extremely cold temperatures
  • 55-hour runtime at max output
  • Powered by a rugged Kubota engine
  • Buderus manufactured boiler for reliable heat
  • Easy operation for a variety of applications
  • Cabinet interior and control panel lights
  • Motorized hose reel
  • Catch basin under hose reel for easy cleaning of hoses
  • Quick-connect hose fittings limit leaks and simplify operation
  • Two 120V GFCI auxiliary power outlets
  • Waste heat from the engine is utilized in the thaw field to maximize efficiency and reduce operational costs
  • Plate-to-plate heat exchangers separate the thaw field from the boiler and engine limiting downtime in the event of a damaged hose

Quality Construction

  • Designed, manufactured, and tested in Alaska for Arctic Tough durability and weather resistance in the most extreme conditions
  • Environmentally responsible construction that features 200% secondary fluid containment
  • High quality industrial materials
  • Proven reliable mechanical components by top manufacturers

Easy Service by Design

  • Large cabinet doors for easy access to all serviceable components
  • Extended-run oil tank increases oil service up to 3000 hours


Heater output334,000 BTU/hr
Normal hose pressure150 psi
HTF flow1800 gph [6814 lph]
Combustion efficiency (boiler)86.8%
Thaw capacity5,000 ft2
Cure capacity10,000 ft2
HosesFour x 750 ft
Heat exchanger material304 Stainless steel
BurnerRiello 40 F15
BoilerBuderus GE 315
EngineKubota D1505
GeneratorMecc Alte
Engine continuous power12 kW
Main breaker rating45A
Auxiliary power20A, 120V, 60Hz
Capacity200 gal [757 L]
Firing rate3.0 gph [11.4 lph]
Total fuel use3.55 gph [13.4 lph]
Secondary containment200%
Length216.5 ft
Width96 ft
Height91 ft
Weight (empty)10,580 lb [4799 kg]
Weight (wet)12,000 lb [5443 kg]


Coming soon.

Model #






Highlight Specs

Max BTU Output: 334,000 BTU/hr
Max Air Flow: N/A
Fuel Tank Size: 200 Gal
Fuel Type: Diesel
Max Fuel Consumption: 3.55 GPH
Run Time: 56 hrs +
Oil Service Interval: 3,000 hrs
Generator: 12KW