When selecting an electric airless sprayer with a diaphragm pump, consider key factors such as pressure range, flow rate, and material compatibility. For light to medium-duty projects, opt for a sprayer with moderate pressure (2000-2500 PSI) and a balanced flow rate to ensure smooth and even coatings. If working with thick coatings like latex or elastomerics, choose a model with a powerful motor and high viscosity handling capabilities. Additionally, look for features like easy maintenance, long hose length, and adjustable pressure settings for better control and efficiency.