I took a shower, set the hot water heater to "vacation", waited 40 hours, then drained the tank. The water was lukewarm, so I didn't waste too much energy. I actually didn't get any sediment out, so either there was none, or I didn't drain it fully. Maybe I'll try again.
When I was done, I closed the drain valve, and it was dripping. Probably had some sediment in the valve seat. So I opened it and closed it a few times, and now it seals just fine.
My tank's relief valve (on the top) says to work it once a year, so I did that too.
The threads accommodate a garden hose.
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