HOT WATER APPARATUS
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United States of America Patent
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app pub date -
Oct 17, 2017
filing date -
Oct 27, 2016
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Abstract
A hot water apparatus includes a burner, a sensible heat recovery heat exchanger, and an ignition plug. The sensible heat recovery heat exchanger includes a case. The ignition plug includes an insulator portion and two electrodes. The insulator portion includes a base end portion and a tip end portion. The tip end portion includes a tip end surface and a groove portion. The tip end surface is arranged opposite to the base end portion. The groove portion is recessed from the tip end surface toward the base end portion. The groove portion is arranged between the two electrodes and provided across top and bottom ends of the tip end portion. The groove portion has a lateral width decreasing from the top end toward the bottom end of the tip end portion.
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