I called the manufacture of the hot water heater, Atwood's technical support. Per their instruction, I measured the resistance across the heating element terminals. It was supposed to measure 10.3 ohms, but mine read nothing at all, like I didn't have the two probes across it. I ordered a new heating element from Mark's RV Parts Here ----> http://www.marksrv.com/atwood_wh_parts.htm
<---- $26.50 with free shipping and no sales tax, shipped Priority Mail. I should have it real soon.
The part is stamped 1400w/110v. You can easily find 1500w/110v shorter elements at any home improvement store for just under $10, but the technical support fellow didn't recommend using them because the extra 100 watts might cause an overload condition. I figure it's worth the peace of mind and the extra $16.00.
I think this applies of all models of the Phoenix Cruiser. Access to the heating element is under the kitchen sink. Remove the screws to the finished wooden access panel. The element is behind a black plastic electrical box that you need to remove two screws to get off and out of the way. The space is a little confining, but managable.
CAUTION: When doing this, be sure your RV power is cut off dead.
AVOIDING THE SURPRISE: Even though you have drained the hot water heater with the outside plug.....When removing the old heating element, 1/2 gallon of water will come rushing out the element's hole. Be sure to place a massive amount of rags to absorb the water. There is no room in there to place a pan or other container. Hold the old element over the hole to let the water out slow enough so the rags can collect the water. It is a lot of water. It keeps coming and coming, seeming to have no end to it.
I will start a new thread, specifically to address 110v hot water heater failure.