I'm stoked to make the slowcooker! I covered the walls & ceiling of my trailer with poly & blankets and it's helped keep the heat in a lot. RVs are so poorly insulated that most the heat just escapes! I'm not sure that the heating of the water in the pipes itself can drive the water upwards but I'm sure with some method of movement like a pump it could be stored in the insulated tank for future use. I quite fancy those propane tankless water heaters myself, I plan to get one soon. I need on demand hot water so I can quickly sanitize goat milking equipment/jars. Glad to have found you also! I saw 'natural horsemanship' in your write up and my reaction was "Yaayy!" this is something I'm just starting to get into. Don't see too many people posting about it. Going to be volunteering at a friend's farm to get more experience with horses in general but one day I hope to befriend one of my own! ^_