Rule of thumb on a tankless heater is get one that will support more than one thing running at a time. I was looking at these before, and the advice I got was to stay with a tank. Reasons... Calcium build up will reduce the amount of hot water (althought the years it would take to do this...), always hot water (with a tank), can run more than one appliance/shower at a time.
Although these were solid reasons not to get one, I wasn't totally sold on not getting one. I think I will get one in the future.
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