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F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
F28D21/0001—Recuperative heat exchangers
F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
F28D21/0007—Water heaters
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FR759808D1933-08-191933-08-19Appareil de chauffe fonctionnant par récupération de la chaleur des gaz de combustion évacués d'un foyer
ExpiredFR759808A
(fr)