The Rinnai Hotflo Electric Hot Water System is a durable and versatile tank for small to medium households. This unit comes dual handed, allowing for flexibility during installation & can also be installed indoors or outdoors. It also includes a pressure temperature relief valve for added safety and greater thermostatic control. Manufactured in Australia to withstand Australia's harshest conditions, this tank is made to last. For homes with high hot water use, the Rinnai Hotflo twin element model is ideal for low-flow instant hot water. It provides a boost to the storage tank overnight or while you're at work, so you have instant hot water when needed.2 elements: the first element heats water during the day, and then the second element kicks in when you need extra hot water after dark - Vitreous enamel steel lined tank - Inbuilt hard water anode protection - Dual handed - Pressure temperature relief valve included - Internal or external installation