When sourcing a wool washing machine, you must prioritize drum material and design. Ensure the drum is made of SUS304 stainless steel to prevent corrosion from lanolin and cleaning chemicals. Look for variable frequency drives (VFD) which allow for precise control of rotation speeds, as wool requires a low-speed, high-torque wash to prevent felting. Additionally, verify the heating method (steam, electric, or gas) and ensure the machine includes a high-precision temperature control system (accurate to ±1°C) to protect the delicate protein fibers of the wool.