How big an area can 3400 but automotive heater heat?

The heating capacity of a 3,400 BTU automotive heater can effectively warm a small area, typically around 100 to 200 square feet, depending on factors such as insulation, outdoor temperature, and the heater's efficiency. In well-insulated spaces, it might heat closer to the higher end of that range, while poorly insulated areas may see less effectiveness. It's essential to consider the specific conditions of the space for accurate heating expectations.