My water heater leaks small amount gas, a technician came to my house yesterday, he used ” bubble leak locator ” to find that the gas is leaking around a nut which under the water heater’s pilot. He used a wrench toen the nut and tested again, it is looks the Problem was solved . He charged $ .Common Water Heater Problems. When you see water that appears to be leaking from the bottom of a gas water heater, it could be because of condensation .Water heaters will typi.y leak from one of two places. Depending on where yours is leaking, you may or may not need a new water heater. If your heater is leaking from its T P valve a.k.a. Temperature Pressure Relief Valve , you might not need a new heater. If it is leaking from the tank, then the time has come for you to get a new heater..A water heater leak may seem like just a minor nuisance, but it can quickly turn into a big problem. Even a small amount of water will cause damage to your floors, sub floors, and walls. Keep in mind that a water heater leaking may be a symptom of a much larger problem..