I want to installa ceiling fan w heater and light in bathroom about it needs a 20 amp breaker. Breaker for bathroom is only 15 amps,

You don't. You run a new circuit.

The wiring in your walls is rated for the breaker that serves it. You cannot simply put in a bigger breaker.

Can you positively identify the size of the wires? If #12, you could use a 20 amp breaker.

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Originally Posted by Stratmando

Can you positively identify the size of the wires? if #12, you could use a 20 amp breaker.

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I didn't suggest this because he'd have to identify ALL the wiring on the circuit (highly improbable) and it would have to have been oversized from the original installation (highly unlikely). ;)

Stan, I was thinking that as well.
We can only use #12 minimum down here.