So project moving slower than I had hoped. Here is the components I will be trying, left to right. 8 in stove element, bottom left 4 PTC heating elements 110-volt, thermostatic switch, 240-volt water heater element 18 inches long, industrial 240-volt immersion heater, broiler element, top far right silicone wire for inside the sand battery to take the heat, bottom far right 36-inch 240-volt dryer element coil. material for sand battery underneath.