We use the hot water systems primarily for showering, and washing up.
Primus Hot Shower
When we bought the Aussie Swag campertrailer in 2005, it came with the Primus Hot Shower. Unfortunately it never work well, so it was replaced with a Coleman Hot Water On Demand. Click on image for more details.
The Coleman HWOD worked very well and finally failed after 5 years of use. We then bought a second Coleman HWOD, and have had 3 failures within a short time, including replacing the battery. Click on image for more details.