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Heating water instantly requires far more power than heating it slowly, which usually means new circuits and sometimes a bigger service.

A storage tank is a continuous load on its own two-pole circuit, and borrowing a nearby dryer or range outlet is not an option.

Heating elements depend on surrounding water to carry heat away, so a few seconds without it destroys the sheath permanently.

That button is an over-temperature cutout, and every time it trips it is reporting that the tank got dangerously hot.

Residential tanks interlock the upper and lower elements so only one draws power, which is why the circuit is sized for a single element.

The rating describes testing for group motor applications, and most modern residential breakers already carry it on the label.

One number tells you the smallest conductor the equipment accepts and the other sets a ceiling on the overcurrent device, never the reverse.

Dedicated describes exclusivity, not amperage, and heating and cooling equipment usually needs its own branch circuit for good reasons.

The short flexible run between disconnect and condenser is a wet location, and the conduit and conductors both have to be rated for it.

Equipment outdoors generally needs a disconnecting means within sight of it, and a breaker in the basement panel does not satisfy that.