If elec side not working, no point is leaving it on. Use the propane til you can get it fixed. No, won't hurt to have both on, but not much point if elec not working. I use both when expecting to use a lot of how water in a short time period. At the age of your unit, have you pulled the anode rod and checked to see if it is still there and not used up?
I had to replace the anode on my '05 after about 8 years.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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