Above which temperature is water defined as 'warm' when testing fire apparatus?

When testing fire apparatus, water is typically defined as 'warm' when it reaches a temperature of 90 degrees Fahrenheit. This temperature marks the threshold where the water begins to be considered warm enough for various testing scenarios, particularly when evaluating the operational effectiveness of fire pumps and other equipment. Warmer temperatures ensure that no thermal shock occurs, and that the components of the apparatus can perform optimally without the complications that can arise from colder water. In practices related to fire operations, maintaining this temperature helps ensure consistent results and reliable equipment functioning during drills or real emergencies.