Water heater cleaning #solution


I have installed a basic 40 isotemp water heater on my boat. I have started a project to clean and replace the anode/resistance heater.  Does anyone have experience of how to remove the heater cover (8 screws) and the anode/resistance assembly?  i bought the 55mm hex wrench but there is no room for it to turn!  I removed the screws from the cover, but it won't come loose!  Can someone help me please?
Jose Prieto
SV Wayag, SM 323
Currently Aguadulce, Spain

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