Are you looking for a tankless, instant hot water source? As opposed to a point of use device, when used here, they tend to be used for the whole house. Several brand names available in the US are Takagi, Rinai, Bosch. Search on tankless and see what you come up with. Note that many areas in Canada would likely have very cold incoming water in the winter - close to freezing, and a tankless system has trouble providing high volumes of hot water under those conditions - it takes a lot of power. If you are willing to live with a low-flow showerhead, one of reasonable size might work for you. Many houses aren't set up with enough power to provide for a large one. Parts of Canada have pretty cheap electric rates because of abundent hydroelectric plants, so that may not be an issue, but that isn't true everywhere.