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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F24H1/22
Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
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F24H1/40
with water tube or tubes
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