I have noticed a small puddle under our hot water heater lately. If I look underneath the heater it looks like its coming down from only one leg. We have sold the house and just had the inspection last week and passed. Could it be from the inspection testing? Condensation? If it is a leak in the tank how do I know and can a plumber detect a leak in the tank or do they always suggest a replacement? Want a cheap solution because moving expenses are eating into cash reserves.