The individual heating system with gas-fired hot water heater and the heating system with gas-fired hot water boiler are introduced.
介绍了燃气热水炉单户供暖系统和燃气热水锅炉供暖系统，分析了供暖系统的调节方式。
Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally two weeks or more.)
长期(一般是两星期以上)没有使用的热水器所连接的热水管道系统可能会产生氢气。
Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally two weeks or more.)
长期(一般是两星期以上)没有使用的热水器所连接的热水管道系统可能会产生氢气。
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