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We have an almost 9 year old Boch 40 gallon indirect water heater. For the last couple of months the hot water has been too hot. I noticed on top of the tank the Nipple is pretty corroded and when I took the anode rod cap off and scraped the foam away it is corroded as well and there seems to be water leaking arournd the bolt for the anode. I'm afraid to put a socket or wrench to the bolt for the anode, it looks like it will crumble. Does it sound like the anode can be replaced? It has never been done before, and that's probably why it's in this condition. I'm disappointed that an indirect like this Boch is failing. I tried to take the pressure relief valve off to get a look inside at the anode but it's seems to be frozen on.