Everyone lives in a home with some way of getting hot water. It may be a basic water heater, gas or electric or a boiler unit. When you have a water heater or a boiler unit they have a tank that stores water and over time the tank will start to rust and leak. Also when you have a tank it continues to heat that same water in the tank all day when you are away and at night you are throwing money out to heat water you are not using. Tankless water heaters have been around for many years in other countries such as Germany, Switzerland, England etc. In this area of the south eastern US it has become more common every year over the past 12 years. Now on average 10 of every 100 water heater we do end up being the old tank type when the rest are now tankless. There are many reasons they are better to have than a tank water heater. Tankless water heaters do not turn on or burn gas or your power bill during the day when you are gone they are on demand water heaters, that only come on when you turn on you faucet. In a 24 hour day without you using any hot water, a standard tank water heater will come on for 6 hours. When going to tankless, you save that 6 hours of gas or electricity each day. When it comes to having a large family or guest at your home, with tankless you have unlimited amount of water so if you want all your baths going at one time Rinnai tankless water heaters can handle that with no problem at all. If you already have a gas tank water heater and change to a tankless, your gas or propane bill will drop 40% on average. Also, many companies like Piedmont Natural Gas offer rebates and incentives to be more energy efficient by switching to a tankless water heater.