Hot water heater is all of 15' from the panel....what gauge?
I have a Stiebel Eltron Tempra series heater for the entire house. Yes, you'll need a panel that can support the amp draw. I don't know what you have in your house and I don't know if you can accurately obtain the information needed to find out if what you currently use can support it. I will say that I have a 200A service panel and my heater has 3 60A dedicated circuits and everything runs just fine with a 5 ton a/c unit for the house, electric wall oven and cooktop. Keep in mind I was able to determine a figure of how much load was being drawn before I bought the heater.
As for performance from the heater itself, no issues at all. A lot of people who have tankless will tell you that electric is a waste or inadequate compared to gas fired tankless, but it isn't true assuming you size it correctly and your panel can support it. The only real maintenance I perform on it is once a year I run vinegar through the heater to descale it.
I build houses and do remodels for a living and have installed numerous tankless water heaters.. They are easy to install and almost everyone is using them now. If you have any questions just pm me and ill help you all I can.
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