HEAT EXCHANGER AND HOT WATER APPARATUS INCLUDING HEAT EXCHANGER
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United States of America Patent
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Issued Date -
May 23, 2024
app pub date -
Nov 5, 2023
filing date -
Nov 17, 2022
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Abstract
A heat exchanger includes a header part that is arranged on an outer surface side of a sidewall part of a case into which a combustion gas is supplied, and has hole parts through which end parts of heat transfer tubes are inserted and forms a chamber communicating between insides of the heat transfer tubes. The heat exchanger further includes a burring part in a tubular shape that protrudes from a circumferential edge part of each hole part of the header part toward the sidewall part side and is externally fitted to the end part of each heat transfer tube, and an extension part that partially extends from a part of a tip circumferential edge part of the burring part toward the sidewall part side and has a tip part abutting against the sidewall part.
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