caveat - 20 amps on a b16 breaker will take a very long time (minutes to hours) to trip; in practice, you may never see it tripping during normal usage, but yea

caveat - 20 amps on a b16 breaker will take a very long time (minutes to hours) to trip; in practice, you may never see it tripping during normal usage, but yeah your walls will get a bit warmer.