I am upgrading my service to 200 AMP. Since the location of the old service is behind a cabinet, we moved the main panel to a different area. This put it more than 15 feet away so we have a 200 amp service disconnect outside and my "main panel" is now considered a sub-panel.
I'm trying to install a new 36kW instant hot water tank. Tempra 36 Plus http://www.stiebel-eltron-usa.com/sites/default/files/pdf/install-tempra.pdf
I'm concerned because this installation guides calls out this model needs a min 300 Amp service. It requires 3 X 50 Amp breakers. My inspector gave my load calc the ok and this is the main reason we are upgrading our service. This hot water tank is pretty over sized for my home so I'm not really worried about drawing the full 150 amps.
Am I able to use 50 amp breakers in a 200 amp panel, or is there some size restriction?