With our 10 gallon hot water heater and the oxygenic shower head, the wife and I can take unhurried showers back to back without running out of hot water. I have thought that when it comes time to replace the hot water heater I might go with the tankless heater. However, like Paz, I don't want to lose the electric option and we've been quite satisfied with water heater. If I was going to buy a Bus I would go with the Aqua-Hot Heating System and get the unlimited hot water (with electric option) plus a much better coach heating system than the propane. The Aqua-Hot runs off diesel (150 gallon tank) versus propane heaters (28 gallon tank).
Travel well, travel safe,
2006 Tiffin Phaeton - 2011 Cadillac SRX