What is the max continious wattage on a 15amp and 20amp breaker?

Can't solve the problem with the information given. Power = Voltage * Current; What's missing?

OK. I'll be nice. 80% of the breaker rating gives you the max current. You know the rest.

Any load on for more than 3 hours at a time is called a continuous load and the circuit needs to be derated or multiplied by 1.25 which is 1/0.8

This may be a first,

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Originally Posted by KeepItSimpleStupid

OK. I'll be nice.

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Finally making progress!

Only kidding Kiss.

Quote:

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Originally Posted by KeepItSimpleStupid

OK. I'll be nice. 80% of the breaker rating gives you the max current. You know the rest.

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Actually 100% of the breaker rating gives you the max current. There is no blanket "80% rule" for breakers. This only applies to certain loads.

Quote:

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Originally Posted by KeepItSimpleStupid

Any load on for more than 3 hours at a time is called a continuous load and the circuit needs to be derated or multiplied by 1.25 which is 1/0.8

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Actually any load expected to be on for 3 hours or more is considered a continuous load. Very little in a home would be considered a continuous, although there are things such as electric heat and water heaters that are specifically by code considered continuous loads.