The two are your low point drains, the other with the lever is your freshwater tank drain. Neither is technically your hot water drain. To drain that you pull the anode in the tank (at least in my TT it's this way).
However, I usually don't bother draining. On average we're out at least every other weekend so I just leave the water that's in the hot water tank there. It's been filtered anyways in the way in, so I'm not too worried about it going bad.
If it's going to sit for a month or more than I'll drain it, via removing the anode rod. That process get's done in my driveway where I can also give the tank a good flushing.
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