对热水循环遥远的热水器导致浪费热水循环系统用泵循环热水器的热水水龙头,减少热水的等待时间几乎为零。所有热水循环系统节约用水。但并不是所有系统节省能源;一些系统实际上导致更高的能源费用。选择一个点播系统。有三种类型的热水循环系统:热虹吸系统、时间和温度系统,和点播系统。点播系统最意义在一个绿色的家庭因为热水注入的使用只在需要时,备用的损失最小化。他们手动激活或无线远程或运动探测器。这样一个系统是添加在勾画出管道时,价格低廉,可以实惠翻新现有的管道系统。安装改造,点播系统使用现有冷水行返回的帮助下一个特殊的阀门。 Time and temperature systems. Hot water is circulated automatically to anticipate demand with the help of a timer and thermostat. An override allows homeowners to activate the pump at non-scheduled times. While time and temperature systems cut waiting time, they increase standby heat losses. Hot water lines are essentially turned into extensions of the hot water storage tank. They save water but increase net energy use. Thermosyphon systems. These work only in a home with a tank-type water heater located below the hot water taps — for example, in a basement. A continuous piping loop is installed between the water heater and the fixtures, with a return line coming back to the heater after the farthest fixture is served. Because the returning water is cooler than the water in the top of the water heater, a thermosyphon…