Around here 1500w devices are VERY common. All of it CSA approved. That's 12.5a @ 120v. or 83% of the max load on a 15a circuit. So I don't see why you couldn't run 12.5a of devices on your 16a circuit. (which probably has the same wire as our 15a circuits... and as mentioned previously, it's the *wire* that's important for safety.)