There are liquids other than water which can be used to extinguish fires, particularly electrical ones.nnAlso gases. I think this more general term is preferable.
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Page 1 of 5 CHAPTER 21 Fire Prevention (Rep. & recr. #48-83) (Am ...
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21.09 Non-Water Based Fire Extinguishing Systems. (c) Size, placement, and position of nozzles or discharge orifices;. (d) Location and identification of ...
www.ci.waukesha.wi.us/Code_Book/21.090.pdf
Principles of Fire Protection - Google Books Result
by Arthur E. Cote, Percy Bugbee - 1988 - Technology & Engineering - 357 pages
Nonwater-Based Fire Protection Systems and Equipment Chemical and mechanical extinguishing methods have been developed to provide wider latitude for fire ...
books.google.co.uk/books?isbn=0877653453...

Довольно часто встречается и такой вариант: water-free fire suppression systems, например здесь:
http://www.complexdrive.com/san-diego-datacenters/FM200 CO2-...