Sometimes a panel has to be removed from the inside, and sometimes there is an adjacent storage area inside or outside that will allow you to access water heater. If you can see the pipes going into and out of the water heater and there is not another pipe in the middle connecting the two, with valves on all three, then it does not have the bypass feature. I would think that a 2007 would have this feature.
2010 Jayco Quest G2(SOLD)
2014 Jayco Eagle 33.5RETS
2007 Ram 2500 5.9L Cummins(SOLD)
2015 Ram 2500 6.7L Cummins 4WD