You just never run out of hot water with a tankless. The tankless water heater doesn’t store water, using energy 24/7 to keep it hot. Powerful burners fire up when you turn on the tap and once it’s going, it keeps on going until you’re done. (great for jacuzzi tubs!) The RL75 is 82% efficient – a far cry better than most tank water heaters. Other Rinnai models can go up to 93% efficiency. And of course it’s Energy Star rated. Rinnai has tankless water heaters for just about any size home and number of bathrooms. If you have the need, you can easily connect two of them. Rinnai has a 12-year heat exchanger limited warranty for residential installations (5 years on parts, 1 year on labor and 5 year labor if registered) NW Natural Appliance Center is a Preferred Platinum Rinnai dealer.