For most customers our SWH-1 solar system will be the perfect solar hot water system. That package comes with all components needed to generate hot water using the sun instead of electricity or gas and comes with our Solarstor tank that can replace or be used in conjunction with your current hot water tank. If your household has very high hot water demand, or if you have more than 5 people living in house, we would recommend looking at purchasing our SWH-2 system.