Boiler water
![Storage tank of water for locomotive boilers.](/Images/godic/202501/01/487_at_water0841.jpg")
![Boiler feed water pump](/Images/godic/202501/01/Weir_boiler_feed_water_pump0842.jpg")
Boiler water is the liquid phase of steam within a boiler. The term may also be applied to raw water intended for use in boilers, treated boiler feedwater, steam condensate being returned to a boiler, or boiler blowdown being removed from a boiler.