I used something like the one you show in the picture on a remote bear hunt this May in Alberta. We used water from the river which was very cold, filled up a garbage can and in a few minutes had HOT water. I believe the one we used had 2 burners, and the weather was not really cold. As long as there was water in the garbage can & propane in the tanks we had hot water

I would recommend the use for a "hunting" shower

good luck