Not sure if it makes any difference whether the water heater is used in electric or gas mode. I prefer the aluminum anode as we camp in places where the water is full of minerals and since the anode is intended to be sacrificial I suspect the aluminum does a better job since it will corrode faster. There isn't enough price difference to warrant not using the anode that does the best job as opposed to having the longest life.
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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