AquaKing Standard includes as a standard feature a thermostatically-controlled heater as well as an automatic filtration system. In addition to that are also included: A bubble system, an insulated cover plus a practical decorative edge. The filter pumps and electrical heater are incorporated within the special insulated steps. The result of testing made during the winter season shows that the electrical use for maintenance heating and filtration is approximately 5 kWh per day with an approximate water temperature of 37°C. The deisgn has no problems coping with temperatures as low as -30°C. During installation the tub itself will be placed on top of the insulation material, e.g. 50mm styrofam which is not included but should be sold in a hardware store close by. Read more about it here!