| 摘要 |
A water heater which includes a heat exchanger having a first passage a nd a second passage connected with the first passage, a gas burner mounted within the first passage, a push blower having an outlet connected with the gas burner for forcing air into the gas burner, and a water reservoir mounted surrounding the heat exchanger, whereby when the gas burner is fumed on, the push blower will be turned on to force air into the gas burner thereby forci ng combustion air generated from fire of the gas burner to move along the first passage and meanwhile the pull blower will be turned on to extract the hot a ir out of the second passage.
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