JUst bought a 91 30ft catalina. The water heater needs a new element, but my question is how do you turn off the elect suppy to just the water heater and not all of the110 outlets. There is only one main breaker for the 110 and what appears to resets for the heater and one for the outlets.My concern is that after I replace the element I want to be able to have 110 without burning out the new element. The boat is still winterized and will not have water avaiable for some time.