There are many types of solar water heating systems, but the drainback is the most efficient indirect system on the market; it prevents from freezing, overheating, and protects the solar system from aggressive water. Additionally, our DBS version is the higher end version because it's completely maintenance free. There's no vacation mode, or anything required. It's plug and play, set it and forget it.
The solar storage tank is fabricated of 316L Stainless Steel instead of a typical enamel lined water heater that only lasts about 7 years (because the warranty is 6 years). The Stainless Steel tank has a 10 year warranty, but is designed to last a lifetime.
The solar should provide for about 80-90% of your hot water needs, but there is one 4500w backup heating element located in the top 1/3 of the tank for inclement weather.