Energy Cistern

Cisterns are the ideal solution to provide drinkable water in remote locations. But, why not heat that water and use the surrounding soil to keep it insulated for months? The idea of the Energy Cistern is to act as a staged heating system by having solar thermal conduits from the SunZero controls heat one of the cisterns, before entering your hot water tank. It is a unique Canadian problem that we can provide the most solar thermal heat, when we need it the least.. so why not bank it for winter?