Just bought a new Jayco 2025 5th Wheel. It seems that a lot of the newer RV's come with tankless hot water heaters. We've never had one in our previous RV's. We boondock about 70% of the time. Other than the usual water saving techniques for boondocking, does anyone have any other thoughts or ideas on saving water while waiting for the water to be hot enough for showers or doing dishes? 