Boiler Room 1 consisted of 5 single-ended boilers. It was on the Tank Top. It was connected to the 3rd funnel uptake with Boiler Room 2. This room was between Boiler Room 2 and the Reciprocating Engine Room.
Boiler Room 1 was mainly used to power the lights and stuff when the ship was in port.
Boiler Room 1 was disintegrated when the ship broke up. The boilers can be found in the debris field.