We provide the best airplane heaters on the market


We believe that superior products are a blend of high quality components, dedicated manufacturing processes, and collaboration between Spencer Manufacturing and our customers. Our products are widely accepted as the best in the industry because they outlast and outperform the competition. Here is a listing of our product lines:


Fully Automated Mark IV-900 GSE Heater


New for 2014, a fully automated Mark IV-900 GSE Heater. It automatically adjusts to all different sizes of airplanes maintaining above parameters.

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Indirect Fired Heater


Blending technology and versatility, the Coldbuster “NANOOK” is Spencer’s first indirect fired GSE heater. It is designed to heat Boeing 737’s down to regional and private corporate jets. The NANOOK’s “Instant Heat” will deliver hot air at 170 degrees F above ambient in sub-zero climates.

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Mark 4-900

Gasoline GSE Heater


Using the same frame and engine as our Mark 4-TDSL, we have increased the heat output by 50% through increasing the high end rpm and by extracting more heat from the exhaust system.

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Mark 4-TDSL

Gasoline GSE Heater


Producing 700,000 BTU’s, the Mark 4-TDSL is our most versatile production heater. Produced since 2006, our variable flow control lets you heat all sizes of aircraft at high temperature.

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Mark 4-DSL

Diesel GSE Heater


This is the perfect choice when the Mark 4-TDSL is too much Coldbuster for the job. The efficient engine produces up to 500,000 BTU operating at 2,600 rpm and can use diesel fuel.

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Not sure which model is right for you?