So I have a client rewiring a house. 1600 sq ft. On demand water heater 29 kw, electric range, dryer, no AC. I came up with a laughable 115 amp service when I calculated the service using the IRC (over 10k va gets derated to 40%) Perhaps I did something wrong? Im trying to decide between a 200 amp service or twin 150s (300 amps). Any thoughts from the community? Also, a water like this wouldn't be considered continuous would it? I guess you could take a 3 hour shower.
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