Separated Combustion Heaters

Save up to 48% off on Unit Heaters

Separated Combustion Unit Heaters are recommended when working in environments with a harsh atmosphere. Examples would include rooms with chemicals, high humidity, or negative pressure. These units pull the combustion air from outside the heated area, either from outside air or an adjacent room, and undergo the combustion process in a sealed chamber within the unit. This process prevents the risk of using toxic indoor air for combustion. If you do not have harsh chemicals in your heating room, check our selection of standard garage and workshop heaters.

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  1. Modine Hot Dawg 30
    Modine Hot Dawg HDS 30,000 BTU Natural Gas Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS30AS0111
    Suggested Retail $1,833.00 Your Low Price Special Price $1,405.00
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  2. Modine Hot Dawg 30
    Modine Hot Dawg HDS 30,000 BTU Liquid Propane Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS30AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $1,833.00 Your Low Price Special Price $1,405.00
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  3. Modine Hot Dawg 45
    Modine Hot Dawg HDS 45,000 BTU Natural Gas Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS45AS0111
    Suggested Retail $1,968.00 Your Low Price Special Price $1,490.00
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  4. Modine Hot Dawg HDS - 45
    Modine Hot Dawg HDS 45,000 BTU Liquid Propane Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS45AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $1,968.00 Your Low Price Special Price $1,490.00
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  5. Sterling 125,000 BTU XF125 Tubular Unit Heater
    Sterling 125,000 BTU XF125 Tubular Unit Heater
    Model: XF125A1NS111
    $1,596.00
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  6. Sterling 150,000 BTU XF150 Tubular Unit Heater
    Sterling 150,000 BTU XF150 Tubular Unit Heater
    Model: XF150A1NS111
    $1,643.00
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  7. Modine Hot Dawg HDS - 30,000 BTU - Unit Heater - NG - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 30,000 BTU 80% Thermal Efficiency - Separated Combustion Stainless Steel Heat Exchanger - Natural Gas
    Model: HDS30SS0111
    Suggested Retail $2,224.00 Your Low Price Special Price $1,663.00
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  8. Modine Hot Dawg HDS - 30,000 BTU - Unit Heater - LP - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 30,000 BTU 80% Thermal Efficiency - Separated Combustion Stainless Steel Heat Exchanger - Liquid Propane
    Model: HDS30SS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $2,224.00 Your Low Price Special Price $1,663.00
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  9. Modine Hot Dawg 60
    Modine Hot Dawg HDS 60,000 BTU Natural Gas Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS60AS0111
    Suggested Retail $2,292.00 Your Low Price Special Price $1,704.00
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  10. Modine Hot Dawg HDS - 60
    Modine Hot Dawg HDS 60,000 BTU Liquid Propane Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS60AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $2,292.00 Your Low Price Special Price $1,704.00
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  11. Modine Hot Dawg 75
    Modine Hot Dawg HDS 75,000 BTU Natural Gas Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS75AS0111
    Suggested Retail $2,380.00 Your Low Price Special Price $1,765.00
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  12. Sterling 175,000 BTU XF175 Tubular Unit Heater
    Sterling 175,000 BTU XF175 Tubular Unit Heater
    Model: XF175A1NS111
    $1,832.00
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  13. Modine Hot Dawg HDS - 60,000 BTU - Unit Heater - LP - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 60,000 BTU 80% Thermal Efficiency - Stainless Steel Heat Exchanger - Liquid Propane
    Model: HDS60SS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $2,689.00 Your Low Price Special Price $1,974.00
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  14. Modine Hot Dawg HDS - 60,000 BTU - Unit Heater - NG - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 60,000 BTU 80% Thermal Efficiency - Separated Combustion Stainless Steel Heat Exchanger - Natural Gas
    Model: HDS60SS0111
    Suggested Retail $2,689.00 Your Low Price Special Price $1,974.00
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  15. Sterling 200,000 BTU XF200 Tubular Unit Heater
    Sterling 200,000 BTU XF200 Tubular Unit Heater
    Model: XF200A1NS111
    $1,975.00
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  16. Modine 55
    Modine Effinity PTC 55,000 BTU NG High Efficiency Condensing Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: PTC55AS0111
    Suggested Retail $2,806.00 Your Low Price Special Price $2,010.00
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  17. Modine 55
    Modine Effinity PTC 55,000 BTU LP High Efficiency Condensing Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: PTC55AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $2,806.00 Your Low Price Special Price $2,010.00
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  18. Modine Hot Dawg HDS - 75,000 BTU - Unit Heater - LP - 80% Thermal Efficiency - Separated Combustion - Aluminized Steel Heat Exchanger
    Modine Hot Dawg HDS - 75,000 BTU 80% Thermal Efficiency - Separated Combustion Aluminized Steel Heat Exchanger - Liquid Propane
    Model: HDS75AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $2,380.00 Your Low Price Special Price $1,765.00
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  19. Modine Hot Dawg HDS - 75,000 BTU - Unit Heater - NG - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 75,000 BTU 80% Thermal Efficiency - Separated Combustion Stainless Steel Heat Exchanger - Natural Gas
    Model: HDS75SS0111
    Suggested Retail $2,814.00 Your Low Price Special Price $2,042.00
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  20. Modine Hot Dawg HDS - 45,000 BTU - Unit Heater - NG - 80% Thermal Efficiency - Separated Combustion - Stainless Steel Heat Exchanger
    Modine Hot Dawg HDS - 45,000 BTU 80% Thermal Efficiency - Stainless Steel Heat Exchanger - Natural Gas
    Model: HDS45SS0111
    Suggested Retail $2,399.00 Your Low Price Special Price $1,785.00
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  21. Sterling 250,000 BTU XF250 Tubular Unit Heater
    Sterling 250,000 BTU XF250 Tubular Unit Heater
    Model: XF250A1NS111
    $2,120.00
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  22. Modine 65
    Modine Effinity PTC 65,000 BTU NG High Efficiency Condensing Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: PTC65AS0111
    Suggested Retail $3,083.00 Your Low Price Special Price $2,195.00
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  23. Modine 65
    Modine Effinity PTC 65,000 BTU LP High Efficiency Condensing Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: PTC65AS0111 / 3H37266-1N/PCONVKIT30-75
    Suggested Retail $3,083.00 Your Low Price Special Price $2,195.00
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  24. Modine Hot Dawg 100
    Modine Hot Dawg HDS 100,000 BTU Natural Gas Separated Combustion Propeller Unit Heater - Aluminized Steel Heat Exchanger
    Model: HDS100AS0111
    Suggested Retail $3,047.00 Your Low Price Special Price $2,211.00
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