Don't deal with these much, tending to stay away from anything that could leak water, but recently I had a call on a 10 gallon with a bad element and no drain valve. Rigged up a Rube Goldberg system with funnels, pans, and buckets and got most of it out but this is ridiculous.
I tried pumping out through the hot supply fitting but got nothing, I had to force the tube I was using through a 90 and suspect it kinked flat right there.
It occurs to me later I could have tried screwing my pump hose to the overflow valve. For future ref, would that work?
I checked these things out at a couple of box stores and so far I have not seen a 10 gal with a drain valve. What gives, guys?