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the issues that i know of with the tankless heaters, are

the flow rate is usually crappy

they draw a lot of current when they kick on, $$$$

I have dealt with the electrical end of several of these, whether electric or gas fired, havent been thrilled with any other them.

I personally would never use one, i like the simplicity of a regular old, run of the mill, electric electric water heater, or gas if its available