Every room in Blue Prince serves a unique purpose, from standard accommodations to vibrant spaces. Among these is the Pump Room, which requires specific conditions to access. This guide provides everything you need to know to unlock and utilize the Pump Room effectively in Blue Prince.
How to Locate the Pump Room in Blue Prince
To access the Pump Room in Blue Prince, you’ll need to unlock the Pool, which also grants entry to the Locker Room and Sauna. Typically, this requires one gem, so ensure you have this resource at hand.

However, merely unlocking the Pool doesn’t grant immediate access to the Pump Room; you’ll still need to explore Mt. Holly to find this hidden area. It may take several in-game days to discover it, so patience is key.
How to Use the Pump Room in Blue Prince
The Pump Room allows you to manage the water flow throughout the estate. You can drain or fill the following locations:
- Fountain
- Reservoir
- Aquarium
- Kitchen
- Greenhouse
- Pool
To regulate water flow in any room, first locate the Blue Prince’s Pump Room Schematic to view the complete plumbing layout.

The numbered pipes indicated on the schematic correlate with the actual pipes in the Pump Room and the relevant control panel. To fill or drain a specific room, trace the piping and interact with the corresponding pumps (identified by red levers).


When you push the lever up, you will drain the room. Conversely, pushing it down will fill it up. Draining is essential for uncovering hidden secrets within the game. Areas like the Fountain, Reservoir, and Pool yield the most rewards when the water is low. For instance, the Pool provides treasures at the bottom, while the Fountain offers access to the basement via the Antechamber. Note that you must first activate the power in the Boiler Room to use the Pump Room’s Reserve Tank effectively.
How to Solve the Boiler Room Puzzle in Blue Prince
When you reach the Boiler Room, your first task is to turn the valves on three green tanks. One tank will be easily accessible, while the others may pose a challenge.
Accessing Green Tank #1

Navigate to the bottom level of the Boiler Room and turn the valve so that the pointer aligns with the green zone.
Accessing Green Tank #2

A barrier blocks the entrance to the second green tank. To bypass it, adjust the red pipes on the ground so that the moving panels near this tank stop in the correct position. The proper setup should orient the straight-line pipe toward the stairs while another pipe connects to the second tank.
Accessing Green Tank #3

The final green tank is located on the second floor and is blocked off. To reach it, adjust the red pipes—one should point toward the stairs, and the other should lead to the red mechanism. Additionally, ensure that the small lever (to the right of the first green tank) is set to the sideways position. This will activate the elevator, allowing you to access the last green tank.
How to Activate the Boiler Room
Once the last green tank is activated, proceed to turn the second-floor lever to the left and open the gated door for easy access to this floor without needing to use the elevator.

Head to the bottom level to adjust the straight-line pipe away from the stairs, and modify the other red pipe to form a T-shape. Ensure the small lever is set to the upward position. It should resemble the layout shown below:

Return upstairs to finalize the activation of the Boiler Room. If three circles light up, you’ve successfully completed the setup.

Once activated, you can manipulate the piping to enable various areas, including the Pump Room. Adjust the pipes for the Reserve Tank in the Pump Room to drain the Reservoir. This pathway will lead you to Room 46, although more puzzles await. For more assistance with Blue Prince, refer to our comprehensive guides on achievements and safe code combinations.
Frequently Asked Questions (FAQ)
How do you unlock the Pump Room in Blue Prince?
To unlock the Pump Room in Blue Prince, you must first gain access to the Pool by spending one gem. After unlocking the Pool, search for the Pump Room throughout Mt. Holly.
What can you do in the Pump Room?
The Pump Room allows you to control water flow in various parts of the estate, including the Fountain, Reservoir, and Pool, enabling you to drain or fill these areas as needed.
How can I activate the Boiler Room in Blue Prince?
To activate the Boiler Room, you’ll need to adjust the valves on three green tanks by navigating through blocked areas and solving puzzles to align the plumbing correctly.