The 90KW small electric steam boiler used in the steam room is a vertical small steam generator with an effective water volume of less than 30L in the boiler liner, and does not require a boiler usage certificate. The electric heating tube is made of 316L stainless steel material, which has a longer service life than commonly used stainless steel materials. Its thermal efficiency is about 98%, and it runs quietly and cleanly, meeting environmental protection requirements. It does not emit NOx (nitrogen oxides) into the atmosphere. The operation adopts a fully automatic control system with LCD display, display panel, Chinese and English display, human-machine dialogue, and real-time information feedback.