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    First what does the oven use/rated for? If the oven calls for the full 50 amps, adding more will be difficult on a 50 amp circuit. Most times you might get away with it, but making a big family and friends dinner plus the water heater will trip breakers.
    – crip659
    Commented Jul 5 at 16:16
  • 4
    If you ever end up in a 'don't do that or it will pop the breaker' situation with hardwired appliances, the quick reference is here: it's not to code.
    – KMJ
    Commented Jul 5 at 17:28
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    Heck, even if the oven only calls for 40A, you won't be able to run a 19A water heater at the same time.
    – Huesmann
    Commented Jul 6 at 12:44
  • Load calc and load management issues are valid, but take a 40,,000 ft look: Wire costs money, builders just plain don't use wire any bigger than what is needed for the circuit they are building.
    – NoSparksPlease
    Commented Jul 7 at 1:48