Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F24
HEATING; RANGES; VENTILATING
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F24H
FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
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1/00
Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
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F24H1/10
Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
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F24H1/12
in which the water is kept separate from the heating medium
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F24H1/14
by tubes, e.g. bent in serpentine form
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F24H1/16
helically or spirally coiled
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F24H1/165
using fluid fuel
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