How to Change a Water Heater Anode Rod

I love me some Rich Trethewey.

Here Rich gives us a quick lesson in the anatomy of a hot water heater and - more importantly for materials science - the anode. He does a wonderful job explaining what an anode is (the sacrificial part of the heater) and describes it as being made of the 'least noble metal that we can put in [the heater]".

He also does a great job actually showing us how to replace an anode rod. He doesn't, however, address the question asked of where to buy a new anode.