Keep in mindthat water heaters have got limited life times. It is also possible that the tank has grown rusty and is the main cause of this leaky cold water. Whenever this is your situation then your hot water heateritself will have to be replaced. Should one found the water heater dripping position is coming through the plumbing, then simply test that for viable explanations. Unfastened connectors for inward waters plumbing to the hot water heater may just be the root cause of this problem. Simply securing your plumbing needs to stop your boiler seeping on the base.