Use this electric baseboard heat calculator to get started. Learn about the wattage ranges for different heater types, from electric to gas, and find guidelines for effective heating based on room size and insulation. The basic rule of thumb in hvac is that you need 30 btu of heating output per sq ft of living space. In this case, do not hesitate to divide the total watts required by the number of the windows for each room. · two easy methods can determine the right wattage for permanent electric baseboard heaters. A 100 sq ft room requires at least 3000 btu of heating output. How does the calculator work? The calculator uses the formula: So, a 150 square foot room needs a heater with about 1,500 watts of heating power. This guide covers wattage requirements for all heater types based on room size, insulation, and heating needs. This calculator estimates the required wattage for electric heaters based on room size, temperature difference, and insulation quality. It helps homeowners and professionals properly size electric heating systems for efficient and effective room heating. · discover how to choose the right wattage for your space heater in our comprehensive article. · selecting the proper wattage for your electric heater ensures efficient heating , lower energy bills, and safe operation. 10 watts of heating power per square foot is recommended for electric heaters. If we rely solely on electric baseboards as a heating source, they are usually installed at the base of windows in order to get the best distribution of heat.