A _________ is used when returning condensate directly to the boiler is not possible.

A condensate receiver is utilized in systems where returning condensate directly to the boiler is impractical. It serves as a storage vessel for the condensate that has accumulated. The receiver collects the condensate, allowing it to be held temporarily until conditions permit its return to the boiler for reuse.

In scenarios where gravity return is not feasible, such as in low-pressure systems or systems positioned far from the boiler, the use of a condensate receiver becomes essential. It can be equipped with a pump, allowing for active conveyance of the condensate back to the boiler, thus improving overall efficiency and minimizing waste.

The other options, although related to steam systems, serve different functions. A steam pump is designed to move steam, not condensate. Steam traps are essential for eliminating condensate from steam systems while retaining steam, and safety valves primarily protect a system by releasing excess pressure. Each of these components plays a critical role but does not specifically address the need for holding and managing condensate when a direct return is not an option.