All storage Rheem water heaters have the Rheem Mains Pressure Advantage built in. This means you will always have a water heater designed to provide a steady, hot and strong flow of water at mains pressure to more than one tap at the same time. Not all types of water heaters can offer this advantage because of the way they work. For example 'coil' and 'instantaneous' water heaters cannot deliver a flow of mains pressure hot water because their water flow is restricted to allow an increase in water temperature as the water passes through the water heater. Rheem Mains Pressure water heaters heat water and store it so that it's ready for you as soon as you need it. This ensures full pressure to showers, washing machines, dishwashers, baths and basins - all at the same time. It's important to consider this because everyone loves lots of hot water and no one likes their shower turning to a trickle when another tap is turned on! So, when you want a reliable supply of hot water delivered at full mains pressure to more than one tap at the same time... Install a Rheem!