燃气热水器安装，有回水管和无回水管热水器安装方法.Installation method of gas water heater in kitchen and bathroom.

家用厨卫厨房燃气热水器安装方法，针对有回水管和无回水管热水器安装方法教程；客信燃气热水器恒温零冷水燃气快速式热水器的水管水路安接方法及燃气热水器工作时的冷水、热水、回水流向示意图.How to install gas water heaters in home kitchens and bathrooms, tutorials on how to install water heaters with and without return pipes; Kexin gas water heater constant temperature zero cold water gas instant water heater water pipe installation method and the cold water, hot water, etc. when the gas water heater is working Return water flow diagram.https://youtu.be/36NTvqBwXPg