Very glad to be solved for you.
It is to living now for the friend in the city, every family is to have those who burn gas, and use water heater burning gas to be compared again now general, when so a lot of friends are being decorated, also can choose to light gas water heater undertake hot water is supplied, although light gas water heater to be compared,meet more cost saving a few, but believe to a few use methods a lot of friends do not understand, for instance we live daily in, does moment of inapplicable of water heater burning gas need not to need to close machine? Should power source otherwise unplug? Is need shut burn gas? I say for everybody in the light of these problems today.
One, does moment of unused of water heater burning gas need not to need to close machine? 
The word for daily to me life, the frequency that actually we use hot water is taller, arrived especially in the winter when, if we will light gas to pass the word of machine every time, if heating hot water, be being opened again also is more troublesome actually, and if be being operated circularly so every time, time grew also is to be able to light the on off system of gas water heater to cause certain damage, pass the word of machine to lighting gas water heater to need not to need so it is good that we or the habits and customs that want him foundation will decide to compare.
But to lighting gas water heater we are in all the time switch on the mobile phone the word of condition, also do not have what advantage actually, because if we do not pass the word of machine, water heater burning gas can be in the condition that switch on the mobile phone all the time, circuit board is in power supply condition all the time, the ageing of the original of a few electric equipment that time grew to enrage water heater to lighting also has certain effect.
If we choose to light,enrage the word of water heater actually, we can choose to buy intelligence to light gas water heater, because be in our unused moment, water heater can close automatically machine, such OK we go to leave out closing the trouble of machine painstakingly, also be more convenient.
2, does moment of unused of water heater burning gas need to unplug power source? 
For the power source that enrages water heater to lighting, when I still do not suggest everybody is used every time, insert on, unused moment unplugs, because of the word of such operations, can more troublesome, and every time if we are operated so, time grew to cause the damage of socket very easily, also not was necessary.
But if if we do not unplug,dropping power supply, also can cause water heater burning gas to be in power supply condition all the time so, this also is a kind of waste to the sources of energy, if we unplug every time to avoid,drop the trouble of power source so, we can choose to take the electrical outlet of switch when choosing socket, we can use such our unused time small switch puts out power source, also be more convenient so.
3, does moment of unused of water heater burning gas need to shut burn gas? 
Choose the word for to this actually, believe need not I said too much, do not use the word of water heater burning gas, need shuts affirmation burning gas, because light gas water heater to although need power supply,be used, but heat the system basically is to rely on to light gas to finish, if we are not shut, can cause the leak that burns gas probably this is a more critical issue, no matter how burn gas,affirming when we are used so should be shut.
And when we use water heater burning gas, I suggest to be able to install to light gas to detect in the kitchen warning decice, also can use the word that leak burning gas causes when lighting gas water heater in us so, call the police for a short while clew we, ensure we are using the safe issue of water heater burning gas.
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