Some angle valves are divided into hot and cold water. The angle valve for cold and hot water is not necessary and can be omitted, but the angle valve is installed so that if there is a problem, the angle valve can be used to control the water leakage, which has the effect of insurance.
If there is no hose in front of the mixing valve, the angle valve can be omitted. If there is a hose, because the hose is very easy to be damaged, the valve on the water heater inlet pipe is far away and cannot be closed in time. There must be an angle valve in front of the hose.
Generally, you only need to install an angle valve on the tap water inlet pipe of the gas water heater; when the water heater needs to be repaired, replaced, or maintained, close the tap water inlet pipe angle valve and cut off the tap water inlet to easily repair the water heater. Up.
If the angle valve is not installed, when the water heater needs to be repaired, the main valve of the tap water in the home must be closed. The main valve is controlled and managed by the community, or tap water cannot be used for other purposes after it is closed, which is inconvenient.
Of course, the most ideal state is to install stop angle valves on both the tap water inlet pipe and the hot water outlet pipe of the gas water heater.