Usually, prefab tiny homes have water heaters running on propane gas or electricity. If you are living off the grid, you might want the propane gas to heat water. Thankfully, the water heaters found in prefabricated houses are the same as in a recreational vehicle and marine applications, and so, you can employ water heaters running on battery power to easily see through the daily routines. However, you may need municipality permit to get a water heater for your prefab home.
Your choice of the fuel for the water heater – electric power or propane gas – would depend on the electric availability nearby and as to where you live in America. For instance, the prefab tiny homes situated in the suburbs may use propane gas with a municipality permit. Moreover, if reducing electricity is your need, propane gas would give you a hot bath, but on the flipside to that, they are generally considered as expensive buys. Electric water heaters are affordable when compared to propane gas types, but then again, you should get electricity that is sufficient enough to see through days on end.
Another option is to use solar panels in an off the grid property and produce renewable energy to supply water throughout your home via utility connections. May the sun shine brightly on your prefab home and give sufficient heating to produce renewable energy; if so, you can directly bank on solar water heaters.
Solar water heaters may be expensive to set up initially but they would serve a long-term purpose. Much like buying the solar panel to stream running water, renewable energy gives a handsome return on investment in due course. However, no rulebook says that you should definitely employ running water and that you must have hot water.
There are plenty of prefab tiny homes out there, which do not use water heater for bathing but to cook food in the kitchen, for basic washing, and maybe, to reduce energy consumption at home. Whether to reduce water consumption in the kitchen or consume hot water for the basic purpose is up to you. So explore the options for getting hot water carefully before investing in one.