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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F24H9/18
Arrangement or mounting of grates or heating means
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F24H9/1818
Arrangement or mounting of electric heating means
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F24H9/1827
Positive temperature coefficient [PTC] resistor
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