Thank you for the opportunity to assist your customer. You may encourage them to consider the J-2000 rather than the J-4000. The J-4000 is the commercial unit and not recommended for home use, because of the 15 minute preheat time. The J-2000 produces steam in less than 2 minutes and will steam for an hour and a half while offering a on and off switch, once turned off, it will produce steam in less than 2 minutes again. We have many customers buy the J-4000, thinking “commercial” is better, when in fact all of our steamers are professional grade. The J-4000 is intended to be used for commercial setting for several hours a day. The metal head with wooden handle will offer more durability and the head will provide more heat closer to the garment while steaming. The plastic head and handle is cooler to the touch and lighter weight to use. The steamhead options is truly a customer preference. I hope this information has been helpful, please let me know if you have any further questions. Jiffy Customer Care Group