Hot water heater hose. If it won't light at all, see the article, ' Fixing Hot Water Heater Gas Valves ' for the issues surrounding this device. You can either contact a plumber to get this done, or you can follow some simple steps to do it yourself. This will cause the burner to operate poorly. When the pilot light is out or won't stay on, you will not have hot water. You can find the links below. Click this link to get the good or not so good news. Thanks for your great question and nice note. Could you see the smoke rising from the tops of our heads?