How to determine BTU needs for different cabins?

Calculating Cabin Size and Climate

To determine the BTU needs for a cabin, first calculate the square footage. Measure the length and width of the cabin, then multiply these numbers together. For example, a 20x30 foot cabin has a square footage of 600 square feet. Next, consider the climate and level of insulation. A well-insulated cabin in a moderate climate requires less heat than a poorly insulated cabin in a cold climate.

Applying the BTU-per-Square-Foot Estimate

Apply a BTU-per-square-foot estimate to the cabin’s square footage. A commonly used estimate is 40-50 BTUs per square foot for a well-insulated cabin in a moderate climate. For our 600 square foot cabin, this would be 24,000-30,000 BTUs per hour. To determine the required propane tank size, consider the average daily heating requirement and the propane tank’s capacity.

Heating Propane Tank Sizing

Consider the propane tank’s capacity, typically measured in gallons or pounds. A standard propane tank is 100 gallons, which is equivalent to approximately 43,800 BTUs. To determine the required tank size, divide the total BTU requirement by the tank’s capacity. For our 24,000-30,000 BTU requirement, a 100-gallon tank would last approximately 0.55-0.69 days. To ensure adequate heat, consider a larger tank size or a more efficient heating system.