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For heating surfaces up to 100 square feet, a 1/2 inch boiler feedwater line is typically recommended. This size provides adequate flow and pressure to meet the demands of the heating system. The choice of pipe diameter is crucial in ensuring efficient operation, as it affects the speed at which water can enter the boiler and the ability to maintain the appropriate water level.

A 1/2 inch line strikes a balance between sufficient flow rate and prevent potential pressure drop issues that could occur with smaller diameter lines. It allows for effective heat transfer without causing excessive strain on the pump or the boiler itself. A larger diameter line might lead to unnecessary material costs and installation complexity, while a smaller diameter could result in inadequate flow and possible operational issues like water hammer or inefficient heating. Therefore, selecting a 1/2 inch line ensures that the system operates efficiently and effectively for heating surfaces of that size.