Broken bathrooms and showers need to be repaired in the game, that's a rule. In fact, the more often you use them, the more often they break down.
Note: these buildings can also be upgraded and after that they will give you more energy after each use. But they will also break down after the upgrade. How can you tell whether you're doing an upgrade or a repair?
That's easy, if a building is broken, you will see it in the name of the building. Also, different resources are needed for different actions.
You can also check the message in the building's menu. "Increase energy bonus" is a message that indicates upgrading. "Generates energy" is a standard message on the building that can also be seen in the repair window.