Electric vs propane: Which is better for off-grid heating?

Off-Grid Heating Challenges

Off-grid heating systems face unique challenges, such as limited energy storage capacity and high energy demands during cold weather. When considering electric vs propane heating, it’s essential to evaluate the overall system efficiency, storage requirements, and fuel capacity. In a tiny home with minimal loads, propane is often a better choice due to its higher energy density and lower storage requirements.

Electric Heating Options

Electric heating options, such as heat pumps and resistive heaters, are often less efficient than propane systems, especially in cold climates. Most off-grid solar systems have limited capacity, making electric heating a challenging option. For example, a typical 2 kW solar array can produce approximately 4-6 kWh of energy per day in winter, which is insufficient to power a 1 kW electric heater for extended periods.

Propane Heating Advantages

Propane heating systems offer several advantages, including high energy density and lower storage requirements. A 20-pound propane tank can provide 80-100 hours of heating at 30,000 BTUs, whereas an electric heater would require a significant amount of energy storage capacity to match this performance. Additionally, propane systems can be easily integrated with a backup generator or a small wind turbine to provide a reliable heat source during extended periods of low sunlight.