The top 3 tankless water heater units of 2017 and the pros and cons of owning one

Owning a tankless water heater unit means you will have hot water on demand, as they heat water only when you turn on the faucet. They usually operate on natural gas or propane. Tankless water units have become the major residential water heating system in Europe and are growing in popularity in the U.S. So, here are the top 3 tankless water heater units of 2017 and the pros and cons of owning one.