Advanced Elements Summer Premium Quality Shower

I'm curious if you would recommend using two of these, as opposed to a 5-gallon bag? Many have said the 5-gallon bag is harder to use & pops easier.

How long does it take to heat up the water? Also, any ideas on something compact that we could take to hang it on?

I'd like to use this to wash dishes when I camp in the desert where water is scarce. Are you able to adjust the water flow to slow it down?

How much space will this take up in a suitcase?