Mark 4-900

Coldbuster GSE Heater

Airflow Up to 6,000 cfm
BTU Per Hour 900,000
Temp. Rise 165-180 F
Engine Zenith ZPP644 4.4L 6cyl, EPA cert. EFI gas
Brake Horsepower 94
Fuel Capacity 50 US gallons
Physical Dimensions

65”H X 48” W X 115”L

 Shipping Weight   3,700 lbs

The most powerful and durable GSE heaters on the market today are the Spencer Coldbuster Mark IV’s. The Mark 4-900 delivers clean and filtered hot air at 165-180 degrees above ambient in sub-zero climates. Capable of delivering 900,000 BTU’s at up to 6,000 cfm, this heater cart can handle any commercial aircraft in service today.


The Mark 4-900 uses the “turbo- dynamic” heat exchanger technology maximizing exhaust heat. Hot airflow can be fully regulated for use with all size aircraft using our “VariFlo” control. New for 2014 is the 50% increase in duct storage space, by moving the rear wheels outside of the frame, also giving our unit additional stability.

Have any further questions?