I have an electric titan tankless water heater its 1yr old. last night all of a sudden it quite producing hot water. no fuse appears to have blown and standby light is on but no hot water just ice cold. please help i know nothing about the new tankless heaters.

I am looking into pruchasing a tankless water heater but do not want to pay more to operate it than the tank i have now. I know my tank runs on 1000 btu's and most tankless heaters run at about 10 thousand. Is it worth it to switch over?