Just be aware that (at least on my TMs) the sink drain pipe goes right in front of the upper water heater outlet. Adding the bypass will require a couple 90° street elbows and a slight modification of the hot water PEX piping. But like you said, a bit of a hassle now makes it oh so much easier later.
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2007/21 TM 3326 (Pride of the Fleet)
2000 2720SL (Rebuild Project)
2002 2619 (Parts TM)
SMARTER THAN GOOGLE!
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