Following the CDC Guidelines for Sterilization the oldest and most recognized agent for inactivation of microorganisms is heat.  Electric steam boilers by Reimers are available in many sizes. Electric Steam Boilers   Of all the methods available for sterilization, moist heat in the form of saturated steam under pressure is the most widely used and the most dependable. Steam sterilization is nontoxic, inexpensive , rapidly microbicidal, sporicidal, and rapidly heats and penetrates fabrics. The basic principle of steam sterilization, as accomplished in an autoclave, is to expose each item to direct steam contact at the required temperature and pressure for the specified time. Thus, there are four parameters of steam sterilization: steam, pressure, temperature, and time. Portable steam sterilizers are used in outpatient, dental, and rural clinics.These sterilizers are designed for small instruments, such as hypodermic syringes and needles and dental instruments. The ability of the sterilizer to reach physical parameters necessary to achieve sterilization should be monitored by mechanical, chemical, and biological indicators.  Steam sources include  Dental Steamers - Sterilization