if you had said "gas water heater" I would strongly agree that the answer would not merely be "no", but "he-- no" for all the reasons historically and repeatedly discussed in these forums.
an electric water heater might
be different than a gas water heater, and brings it's own set of issues.
electric usage will be the first issue. depending on the size of the heater, you could quickly chew up a large portion of the 120 VAC electrical capacity in your TT.
read the specs, and compare water + electrical capacity vs. usage. I'm thinking that, unless you're talking only enough water to wash your hands and some dishes, the numbers may not
work for you.