The maximum allowable working pressure shall not exceed the following limitations: steam boilers -- 15 pounds per square inch, hot water heating and hot water supply boilers -- 160 pounds per square inch, and temperatures not exceeding 250 degrees Fahrenheit, potable water heaters - 160 pounds per square inch and temperatures not exceeding 210 degrees Fahrenheit.
229 Neb. Admin. Code, ch. 25, § 002