How should heating capacity margin be evaluated when buying a lifting noodle cooker?

Start from your peak-hour batch loading: how many baskets of noodles go in back-to-back, and how fast must the water return to a rolling boil? Size the heating elements with roughly 15-25% headroom over the calculated duty. Under 15%, temperature crashes during continuous batches and recovery drags; over 25%, you pay for a heavier supply, thicker cable and bigger breaker than the kitchen needs. At handover, run three consecutive full lifting-basket loads, time how long each takes to climb back above 98C, and log the actual voltage and current against the nameplate. Recovery beyond 90 seconds means the margin is too thin; sign off only when those figures hold.