If you have cold water, but no hot water and you have a gas water heater, check the pilot light. Follow the directions on the heater to make sure that the pilot light is working properly. If you are unsure how to do this, call your local gas company. They may send out a serviceman, possibly at no charge, to help you with the heater.
As a note, many newer water heaters have no pilot light. Instead they have an electronic ignition.
If you have followed the directions for your heater so that the pilot is lit (or it has an electronic ignition) and you know that the gas is flowing to the heater, but it’s still not producing hot water, try turning up the water temperature.
If you can’t get the hot water heater working, we can send out one of our experienced technicians to fix the problem for you.