What type of fixture is used for boiling instruments, typically being portable or connected to the plumbing system?

The correct answer is the sterilizer, boiling type. This type of fixture is specifically designed to boil instruments, ensuring that they are sterilized for safe use in various applications, such as medical facilities or laboratories. The boiling action effectively eliminates microorganisms, making it a crucial tool in maintaining hygiene and preventing infections.

Sterilizers of this kind can either be portable, which offers flexibility in their placement and use, or they can be connected directly to the plumbing system for continuous operation. This connection allows for an efficient and reliable source of water, ensuring that the sterilization process can be carried out without interruption.

Other options do not serve the same specific purpose. A boiler primarily heats water and is used for heating systems rather than sterilizing tools. A water heater delivers hot water for domestic use but is not designed for the sterilization of instruments. A steam cleaner uses steam to clean surfaces but does not specifically focus on the sterilization of instruments through boiling.