Eco-friendly tankless water heaters give you hot or warm water when you need it. There is no need to wait for your whole storage tank to get filled with hot water before you use the water you need. Some of these units cannot be used to supply multiple areas with hot water, particularly if you have a large family. For example, one cannot be enjoying a hot bath at the same time as running the dishwasher or doing laundry; particularly when you have a small tankless unit. The ideal solution would be to have two or three of these heaters connected directly to the point-of-use if you want to supply hot water simultaneously for different purposes.
Read more info about point of use water heaters at http:ReviewTanklessWaterHeaters.com