Hot Water Service Stuffed?

Hi Guys,

My hot water service has started leaking water from the top. It is a Rheem Indoor Natural Gas water heater, although it has been installed outdoors, why?....I have no idea I have only had the house for less than a year.

The leak is coming from a sort of cap on the top of the tank, see photos below. Can anyone advise if this is fixable? I am not sure if it's the anode rod or just a pressure cap...

Please help!

Adam
http://img99.imageshack.us/i/img000851.jpghttp://img99.imageshack.us/img99/3258/heater1.th.jpg
http://img99.imageshack.us/img99/9318/img000851.th.jpg
http://img99.imageshack.us/gal.php?g=heater1.jpg


Sorry guys, I am having trouble adding the attachments.


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