What some of the others said:
220/240 V is a tad more efficient, as the lower current has less "IR" drop
in the feed wires associated with it.

And, in addition to being easier on the wires, 220/240 inherently balances
the load lines coming into the house.
It is possible, with numerous large 120 V devices, to load only one leg
coming into the house, unless you explicitly balance stuff.
I deal with this all the time.

With 220/240, you don't have to worry about it.

Always go 220/240 when possible. Whenever possible, I rewire motors from
110 to 220.

In some cases, 220 just isn't readily available in some parts of a house.
Then, yer stuck w/ 110/120
--
------
Mr. P.V.'d (formerly Droll Troll), Yonkers, NY

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"Steve Barker" wrote in message
...
A 220v machine will always be a little more efficient than a 110v one.

--
Steve Barker







"BryanL" wrote in message
oups.com...
I'm planning to purchase a steam shower for my master bathoom and have
been doing some serious research, but I'm still hesitating between a
110V unit and 220V unit. The 110V is certainly more convenient, but
it's not ETL or UL certified. THe 220V is ETL certified but I heard
that it's very costly to run. What shall i do?