They sell the miner separate from the power supply because quite a few of us don't WANT to be stuck with a 220-only power supply (pretty sad design IMO, there is no sensible reason why they couldn't have designed the PS to handle 100-240 like MOST modern power supplies in the 1600 watt and under range), or prefer other power supplies WITH A BETTER TRACK RECORD OF RELIABILITY or lower cost than theirs (based on what I've read about that APW1600 thing, I have ZERO interest in it).
Ja by all accounts theri Batch-1 supplies sucked. But - a couple weeks after b2 came out with pretty much zero issues I started using them. Now have 25 of Bitmains 1600w PSU and zero problems with them. Typical ambient they and the miners are in is 85-90F in the summer.
Frankly, as long as miners need over 1kw the 220v requirement is not bad. Gotta remember many homes like mine (built in 1962) do not have outlets really suitable for sustained loads like that. The original wiring was 16ga fer chrisake. One of the first projects I did was changing that to 12ga runs for outlets and 14ga for most lighting circuits.
Ja I had to wire from what was a 220v dryer breaker to feed the 4x s7's I keep at home but it is by far the best way to go. Also do not have to worry about unbalanced lines from the pole or due to the house 110v loads anymore either.
edit: Also, my 4th 1-fan s7 will arrive tomorrow. So far rather happy with them and surprised that db seems about the same as the 2-fan ones as are temps. Hmm.