After reading the electric tankless water heater reviews, I know what I want. As we know I need a hot water supply for my bathroom, because kids love it and I can not take a cold water especially during the cold season like icy winter. They can supply few gallons of waters per minutes, I have a water storage like a bath tub at bathroom, this can be useful for temporary keep the hot water in the house. This device real useful for us, no need huge space and can be attached on wall. Yes, I have a small house that can provide space for standard or solar water heater.
With price of gas raised again, I can not take this model. So I get the electric tankless water heater. Hope the electricity price is never get high anymore. Not only for price reason. I am also aware with gas, they are vulnerable and if something worst happen they will blow up our house. Electricity is saver I think.