It's to run the HW on electric. Note: make sure your HW tanks is fully full of water, element will burn out in seconds if not full. propane will heat the water faster then electric. You can use both at same time. On electric, HW heater will run on 110 volt, so for electric you must be pluged into shore power or on generator. just remember not to lose pin and turn off when breaking camp. Most of the time we just use propane unless we arw going to be at one place a long time.
2011: 54 days, 2012: 218 days, 2013: 175 days, 2014: 196 days
2015: 188 days, 2016: 72 days,
2009 Berkshire, 390QS, and toad