Best heater in the market with 2 year manufacturer warranty... it is made in US that is what I love about it than the cheap Chinies made craps in the market. It is easy to install and produces instant heat and instant defrost time. It can also regulate heat with High and Low heat settings and adjustable fan speeds. Manufacturer says the life expectancy of 10,000 hours and that is a good news. I did some research and found these type of heater are 300% more efficient than typical hot water systems.