Ive always done trad wc .Just not sure about this wfps ,ive only got houses.Thes past few months have been so cold , i get hot water from my home and a bucket of water lasts me all day , problem is that the water gets cold....Now any ideas on say an element , or a tank that can keep my water hot all day and say maybe work off a 12v etc.This weather has been so cold and the only form of heat is hot water and my heater in my car when ive finished the house, but when your hands are cold boy you have pain and hard to cope with . Any thoughts cheers