In article jon_d.256726$0u.136440@fed1read04, "SQLit" wrote:
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I think 220 volt gfci's work as well as the 110. Exception is that
neutral
not used - current in both power lines must be equal.

quoted from the Siemans link
"To protect against electrical shock, Siemens GFCIs continuously monitor the
difference in current between the hot and neutral conductors."

Since the heater does not have a neutral how will a GFCI provide any
increased safety?

AFAIK, 240V GFCIs measure the difference in current between the two hot legs.

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?