Tankless water heaters have been called the modern way to have hot water, and saves energy while also cutting your utility bill. These water heaters have a relatively simple design that allows you to have hot water without storing huge amounts of water in a tank. A standard water heater will store and heat 40 gallons of hot water. In the simplest terms possible, feed water runs through tubing that gets heated by either electrical elements or gas burners. It comes in cold and goes out hot, so that as soon as you turn on a hot water faucet, you get instant hot water.
So far so good, right? Cold water in, hot water out, no bulky storage tank and very energy efficient. But before we go into the whys and wherefores of tankless water heaters, how about a bit of history first.