The J-4000 is designed for commercial purposes. This steamer has a durable die cast aluminum outer housing unit with a built-in, easy-to-read water level sight gauge, 1500 watt incoloy heating element and a stainless steel internal steam chamber. The J-4000 offers convenient preheat and steam settings, which allows you to have steam on demand. The unit takes 15 minutes to reach a PREHEAT temperature and then 5 more minutes to achieve full STEAM. The J-4000 will steam for 2 hours per filling.