(19)
(11) EP 0 309 199 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.08.1990 Bulletin 1990/32

(43) Date of publication A2:
29.03.1989 Bulletin 1989/13

(21) Application number: 88308704.1

(22) Date of filing: 20.09.1988
(51) International Patent Classification (IPC)4: F24H 1/18, F24H 9/12
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 21.09.1987 JP 236859/87

(71) Applicants:
  • CHUBU ELECTRIC POWER COMPANY INC.
    Nagoya-Shi Aichi-Ken (JP)
  • KABUSHIKI KAISHA TOSHIBA
    Kawasaki-shi, Kanagawa-ken 210 (JP)

(72) Inventors:
  • Kurachi, Yasuhiko
    Saori-cho Ama-gun Aichi-ken (JP)
  • Mori, Kazumi
    Okazaki-shi Aichi-ken (JP)
  • Koizumi, Hisao c/o Patent Division
    Minato-ku Tokyo 105 (JP)

(74) Representative: Freed, Arthur Woolf et al
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Hot water boiling apparatus


    (57) A hot water boiling apparatus includes a hot water tank (11) filled with water. A water supply pipe (14) and a hot water supply pipe (17) are connected to the bottom and top of the tank, respectively. A bubble pump unit (20) is arranged in parallel with the tank. The pump unit includes a body (27) having a boiling chamber (67), electric heaters (24a, 24b) for heating the water in the chamber, a first connecting pipe (30) for guiding water from the tank to the body, a guide pipe (36) for feeding the water, guided through the first connecting pipe, into the boiling chamber, and a second connecting pipe (33) for guiding the water heated in the boiling chamber into the upper portion in the tank. The guiding pipe is arranged so that heat is exchanged between the water in the boiling chamber and the water flowing through the guide pipe.







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