| 摘要 |
A water heater. The water heater includes a water circuit adapted to conduct water to be heated, a combustion system operable to produce products of combustion and operable to provide the products of combustion to heat water in the water circuit, and a fuel train assembly configured to provide fuel to the combustion system. The fuel train assembly includes a gas expansion chamber, a first gas shut-off valve positioned upstream of the expansion chamber, and a second gas shut-off valve positioned downstream of the expansion chamber.
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