What is a characteristic of pumped recirculated evaporators?

Pumped recirculated evaporators are designed to circulate refrigerant or secondary coolants efficiently, which means they are not required to be positioned near the liquid feed vessel. This characteristic allows for greater flexibility in the layout of refrigeration systems since the evaporators can be installed further away from the source of their liquid feed without loss of performance. This is particularly useful in complex installations or larger facilities where space management is essential, and it also facilitates easier maintenance access as the evaporators can be located in convenient positions.

The other options are less accurate as they imply limitations or specifications that do not align with the functionality of these systems, such as the idea that they have to be close to the vessel or operate at lower capacities or constant temperatures, which does not capture the essence of their design and operational flexibility.