(obscure) question about dual voltage in Canada

[w0z]

I was chatting to a non-technical person back over here for a visit but who now lives in Canada. He told me that the domestic voltage is 110v but some properties including his have a second feed of higher volts (unspecified but 200 and something Volts) for higher power domestic appliances.
Does anyone know how this is usually done? Is it simply a case of using the voltage across 2 phases of a 3 phase install?
He said he had no idea about this until he moved there and the only info I could glean was that it comes into the house at that voltage on a 'separate circuit' - he never installed any conversion equipment.
I tried a quick search but couldn't find anything.

 

[snowhead]

Why do so many people think it is 110/220v?

They don't.

But when it comes to typing 120/120 its alien and comes out 110/110

 

[w0z]

He was wrong. It is 120v.

thanks for the correction; as I said, he isn't technical and the issue was how the dual voltage was achieved.