This is the 4969th most frequent Russian word.
котельных
"Котельных" translates to "boiler rooms" in English.
Here, 'котельных' is used in the genitive plural form to refer to multiple boiler rooms, indicating places where boilers are installed and operated.
Инженеры проверили состояние котельных перед началом отопительного сезона.
The engineers checked the condition of the boiler rooms before the start of the heating season.
In this sentence, 'котельных' is used in the genitive plural to describe the subject ‘new boiler rooms’ related to the project.
Проект сооружения новых котельных был одобрен городскими властями.
The city authorities approved the project for the construction of new boiler rooms.
Here, 'котельных' serves as an adjective in the genitive case, describing the staff belonging to the establishments (boiler rooms).