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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F24H1/20
with immersed heating elements, e.g. electric elements or furnace tubes
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F24H1/206
with submerged combustion chamber
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