Considering the headache I'm going through, unless if you have loads of electricity coming to your house and you aren't using much of it (minimum recommended service for my relatively small model is 150amps), I would not recommend an electric tankless heater. Plumbers don't know shit about them, so you might as well install them yourself, but even though it's pretty straightforward, I would be wary about installing it myself. A 'qualified' professional is recommended by the manufacturer, which pisses me off a bit because I simply couldn't find a qualified professional that has any experience installing the damned things.
In short, for a whole house, you're probably better off getting a gas heater that is suited for your needs. A lot more is involved in the installation, but if you're going to hire a professional you might as well make them work for it.
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