Does Heating with Propane Give Off Condensation?

Heating with propane can indeed lead to the production of significant amounts of condensation, as the combustion process releases water vapor into the air. For every pound of propane burned, approximately 1.6 pounds of moisture is produced. This excess moisture can cause various issues, such as mold growth and damage to building materials, especially in small, poorly ventilated spaces.

Understanding the Propane Combustion Process

When propane is burned, it undergoes a chemical reaction with oxygen from the air, producing carbon dioxide and water vapor. The chemical equation for this reaction is:

C3H8 (propane) + 5O2 (oxygen) → 3CO2 (carbon dioxide) + 4H2O (water)

For every molecule of propane burned, four molecules of water are released. The molar mass of propane is about 44 grams/mol, while the molar mass of water is about 18 grams/mol. This means that for every gram of propane burned, approximately 1.64 grams of water are produced.

Quantifying the Condensation Output

does heating with propane give off condensation

To better understand the amount of condensation produced by heating with propane, consider the following data points:

Propane Consumption Moisture Production
1 lb of propane 1.6 lbs of moisture
1 gallon of propane 4.8 lbs of moisture
1 kg of propane 2.6 kg of moisture

These figures demonstrate the significant amount of moisture that can be released into the air when heating with propane, especially in enclosed or poorly ventilated spaces.

Potential Issues Caused by Propane Condensation

The excess moisture produced by heating with propane can lead to several problems, including:

  1. Mold Growth: The damp conditions created by the condensation can provide an ideal environment for mold to thrive, leading to potential health issues and damage to building materials.

  2. Damage to Building Materials: The moisture can seep into walls, floors, and other surfaces, causing swelling, warping, and deterioration of materials over time.

  3. Corrosion of Metal Components: The water vapor can condense on metal surfaces, leading to rust and corrosion, which can affect the lifespan and performance of appliances and other equipment.

  4. Reduced Heating Efficiency: Excess moisture in the air can make it more difficult for the heating system to effectively warm the space, reducing its overall efficiency.

Mitigating Condensation Issues

To address the condensation issues associated with heating with propane, there are several strategies you can employ:

  1. Use Vented Appliances: Opt for propane-powered appliances that are designed with proper venting systems to remove the excess moisture from the space.

  2. Ensure Adequate Ventilation: Provide sufficient airflow and ventilation in the space to allow the moisture-laden air to be expelled, preventing buildup.

  3. Install a Dehumidifier: Running a properly sized dehumidifier can help remove the excess moisture from the air, reducing the risk of mold growth and other issues.

  4. Monitor Humidity Levels: Regularly check the humidity levels in the space and make adjustments to the ventilation or dehumidifier as needed to maintain a healthy indoor environment.

  5. Insulate and Seal the Space: Properly insulating and sealing the space can help prevent the formation of condensation on cold surfaces, such as walls and windows.

By understanding the condensation issues associated with heating with propane and implementing the appropriate mitigation strategies, you can ensure a safe, comfortable, and well-maintained living or working environment.


  1. How much water does burning propane produce? – Tiny Wood Stove
  2. Propane Heater and condensation? : r/vandwellers – Reddit
  3. Just How Much Humidity can I expect from propane heat? – Van Living Forum
  4. Condensation created by propane heaters. – AVION Travel Trailers
  5. Fighting condensation | The Garage Journal