The detailed directions are printed on front of EVERY gas regulator. - However, in general, turn regulator switch to OFF for 2 minutes, then to PILOT and depress for one minute, then light pilot or press clicker till it lights. Keep PILOT pressed for 2 more minutes then slowly release it. If it stays on then turn main switch to RUN or ON. (if the pilot has to be lit manually, I use a barbecue match, 12 " long.)
THERMOCOUPLE or defective gas valve
Same as any hot water heater. Turn the gas valve to off.
If it is gas operated, the hot water heater may not light because it may have a defective millivolt sensor. The millivolt sensor is heated up by the pilot and generates a fractional amount of voltage telling the gas valve that the pilot is lit and the gas valve can now be safely opened to heat the water heater.
Gas heater & electric heater both are available.
No, it is not dangerous. (Unless you are working with a water heater that is 20+ years old.) In any modern hot water heater, if the pilot light goes out a fail-safe will go off - preventing gas from leaking out. Also, there is a sensor so if there is not enough air-flow or oxygen with the water heater, it will shut off the gas.
Yes, your gas water heater will still distribute hot water.
Side of water heater, near bottom.
You cant
If the tub is not getting hot water the issue is probably with the hot water heater. The hot water heater may have tripped a breaker or the pilot light went out.
If you have a gas water heater and your pilot light will not light, the most common problem is a faulty thermcouple. A licensed plummer can easily and cheaply fix this or you can find information to do it yourself online.
thermopile
no