Much has been written lately about the potential of scalding associated with sink, shower and bathtub fixtures. And, viewpoints certainly vary. A balanced perspective will come from the American Society of Sanitary Engineering (ASSE), which is in the process of finalizing a comprehensive, integrated set of standards that segment and guide the various products by type and overall system design. The specifier's challenge today is in not looking at each individual valve, but considering the role each valve will play in the overall system design. To start, consider the chart in Figure 1, which delineates the various types of ASSE-compliant valves that may be needed in differing applications throughout a single system.
The water heater is set at the maximum temperature needed, which for the purposes of our example will be 140