If you're at all skeptical about whether the water heater drained, just remove the anode rod and you can even look inside. Also a good time to check the anode rod for deterioration. (and possible replacement) The anode rod is on the big plug that is at the bottom of the heater tank on the outside. Mine is 1 1/16" and I assume others are too since that's the size on the replacements you can buy.
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