When you say "no power at water heater hookup" do you mean the wire (Romex) going into the back of the water heater is dead? There are several things to check on/inside the water heater, but if the feed is dead, possibilities narrow. Most times the Romex going from the breaker to the heater is a straight shot (you might be able to physically trace it). Sometimes there is an outlet on the same circuit (You can find this by turning breaker on/off hopefully). Punch-downs inside RV style outlets come loose, so you could have good power in to this outlet, no power out, going to water heater. Just a speculation, without knowing more about your situation.
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