The installation of unions in both the hot and cold water supply lines is recommended for ease of removing the water heater for service or replacement.
建议在热水和冷水管线上安装管接头，以方便热水器的维修或更换。
Turn the water off at the shutoff valves and remove the hot and cold supply lines running from the shutoff valves to the faucet.
关闭给水总阀，将总阀到水龙头间的冷、热水管拆除。
Check all supply lines and filters for obstruction and ensure that you have an adequate supply of water to the inlet of the pump.
检查所有供应管线和过滤器是否有故障，确保有足够的水供给到水泵进口。
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