When sourcing a heavy-duty steamer, prioritize heating power (typically 1500W-2500W) for rapid steam generation and steam pressure (measured in bars, ideally 4-6 bar) for deep cleaning or industrial cooking. Ensure the water tank capacity aligns with your usage needs to minimize downtime; for heavy-duty applications, a continuous-fill system or a tank larger than 2 liters is recommended. Additionally, verify the boiler material, where stainless steel is preferred over aluminum for longevity and corrosion resistance.