Ah I see, I meant that because we won't always have hookups I want a PROPANE or a COMBO tankless system vs ELECTRIC-ONLY tankless system. We are only expecting to not have full hookups less than 10% of the time on the trip we have planned.
And yes, for those few times we are in national parks or similar places without full hookups we will conserve water and my wife won't wash her hair those days.
We're likely to even get a portable dishwasher for convenience, and those use significant water also! We really plan to have hookups quite often, my wife might not go on the trip if its too "rough".
Our MH is a 2018 Winnebago. It came with a standard 6gal propane water heater. Now the only question is which tankless system to get! Ideally a combo electric/propane tankless system with adjustable temperature.