The primary differences lie in pressure consistency, temperature precision, and surface area. A professional heat press provides uniform, adjustable pressure across the entire heating plate, which is critical for long-term washability of HTV (Heat Transfer Vinyl) and sublimation. Household irons often have uneven heat distribution due to steam holes and rely on manual pressure, which can lead to peeling. For B2B sourcing, prioritize heat presses with digital controllers that maintain a temperature variance of less than ±3°C.