In Clare Snyder writes:

[snip]

Your only option is a 1500 watt.

Section 422-14 of the National Electric Code reads:

b) Storage type water heaters. All fixed storage type water heaters
having a capacity of 120 gallons or less shall have a branch
circuit rating NOT LESS THAN 125 percent of the nameplate rating of
the water heater.

Just as a related explanation: In general, if you're using
a "continuous load", that is, one that'll stay at maximum
rating for over (ummmmm.... 15? minutes at a clip?), you're
supposed to de-rate the ampacity (current carrying rating)
of the wiring.

Reason is that the rating is based in large part on
the heating the wiring goes through.


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