If the water heater is going to be shut down for an extended period, the drain valve should be left open.
If the water heater is going to be shut down for an extended period, the drain valve should be left open.
如果打算长期关闭热水器，则排污阀应该保持开启状态。
If the water heater is going to be shut down for an extended period, the drain valve should be left open.
如果打算长期关闭热水器，则排污阀应该保持开启状态。