High efficiency water heater
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United States of America Patent
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Jul 14, 2009
Grant Date -
Jan 22, 2004
app pub date -
Feb 26, 2003
filing date -
Jun 4, 2002
priority date (Note) -
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Abstract
A flue system is provided for a water heater having improved heat exchange efficiency. The flue system includes an upstream heat exchange portion having at least one substantially vertical flue tube. The flue system also includes a downstream heat exchange portion having at least one substantially vertical flue tube. The upstream heat exchange portion provides a first pass for heat exchange with water in a water heater. The downstream heat exchange portion provides a second pass for heat exchange with water in the water heater.
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