adjective
: of or being a steam or water heating system in which there are separate supply and return pipes so that each radiator receives a direct supply of the hot water or steam
adjective
: of or being a steam or water heating system in which there are separate supply and return pipes so that each radiator receives a direct supply of the hot water or steam
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012