I was hesitant. But after installing & using it, I LOVE IT!
I live in North Georgia. Heats the water hot! Gave me a new space for storage where my old massive tank heater was. I do have the 200 amp service, but I notice when it runs, SOME of the lights dim, but barely. But I notice. No big deal because the few times a day when it does run for the dishwasher, laundry or bathrooms, who cares! I don't have a water pressure meter. So I noticed while the temperature setting was fine for showers the whole family liked, if I turned the faucet about 1/4 of the
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way down (on the pressure, as if I was going to shut it off), I noticed it got really hot! This told me that my water pressure was cranked too high. So I lowered my water pressure a bit, UN-noticable to the family. Now It functions at the peak flow performance & I can actually set the temp LOWER than what I originally thought!