Where is an atmospheric type vacuum breaker most likely installed?

An atmospheric type vacuum breaker is primarily designed to protect against backflow and is used in specific situations where back siphonage could occur. This device is typically installed in areas where there is a potential for a cross-connection between a potable water supply and a non-potable source.

In the context of the choices provided, the other options—service connections to a residence, boiler system makeup water lines, and services to a car wash—often require more robust backflow prevention methods due to the potential for contamination. Residential services and boiler systems usually incorporate higher hazard protections like double-check valve assemblies or reduced pressure principle backflow preventers, ensuring that there is adequate protection against backflow and maintaining water quality. A car wash system, which can involve a variety of chemical mixtures and high-pressure wash systems, also requires substantial backflow prevention measures.

Since none of the presented scenarios represents a situation where an atmospheric type vacuum breaker is appropriate, the most fitting conclusion is to state that none of the above options accurately reflect where this device is likely to be installed, leading to the selection of that answer.