True or false: Facility personnel can be confident that the peak hot water temperature will consistently be within 1 degree C of the water heater setting in large building systems.

The assertion that facility personnel can be confident the peak hot water temperature will consistently be within 1 degree Celsius of the water heater setting in large building systems is false. In practice, various factors can lead to temperature fluctuations throughout a plumbing system.

In larger buildings, the distance between the water heater and the point of use can allow heat loss as the water travels through pipes, particularly if the building's insulation is inadequate or if there are changes in water pressure. Additionally, the mixing of water from different sources or fluctuations in demand can create disparities in temperature, meaning that it is unlikely for the peak temperature to remain consistently within such a tight margin of the setpoint.

Therefore, while modern systems may strive for precision, several variables make it unrealistic to assume that temperature will always be within a 1 degree C range of the heater setting in complex plumbing setups.