Is that heat on demand or does it contain a reservoir? And if it holds water, how much? We use the Iron Mountain rechargeable pump\shower which works well. Need to heat the water first, if this isn't on-demand, so will this. If I was basecamping for an extended period of time, what you have looks like it would be nice. If moving around a lot, seems like something smaller and simple would be a better option? We used our Iron Mountain for 3 months last fall as our house shower and for doing dishes when our well went dry. I am impressed with the performance. 2.5gal would shower one of us comfortably if we paused while sudsing up (both with shoulder-length hair) and could get 8-10 uses before charging via USB. Charging took 2-3 hours. Might be an option.