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Correct, only the suburban heater uses an anode. If you want to keep it simple, put 3-4 gallons of anti freeze in the fresh tank and pump it through with the water pump through all fixtures with the heater bypassed. Don't forget the washer hook ups/outside faucet/low point drains etc. In the spring flush it out real good and sanitize the fresh water tank and lines with a cup or so of bleach in a full tank of fresh water
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