Water heater
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United States of America Patent
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Nov 19, 2019
Grant Date -
Jul 5, 2018
app pub date -
Jun 21, 2016
filing date -
Jul 9, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A water heater includes a vessel (20) provided with a burner (3) having a downward combustion surface, a fan casing (10) accommodating a fan (10a) for supplying a mixture gas of primary combustion air and fuel gas to the burner, an annular packing connecting a first connection end surface at a downstream end of a first passage forming a downstream-side passage of the fan casing with a second connection end surface at an upstream end of a second passage forming an upstream-side passage of the vessel in airtight state, and a check valve (5) disposed near the upstream end in the second passage (2).
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