We use LP only for hot water.
1) Much faster recovery time on propane;
2) Wattage delivered to water is voltage dependent; the lower the campground voltage; the less watts the electric heater delivers to the water. In the heat of summer, older campgrounds using aluminum supply wires have large voltage drops in their circuits when under Air Conditioning Load.
3) If you use both at the same time, even faster recovery time.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW