The first post makes a couple of good points about renewing insurance with different providers, but doesn't explain that renewability is also contingent on good health - no matter which company is being used.
Renewability is an important consideration for visitors intending to stay in Canada longer than one year at a time. I'm also an independent travel insurance broker, and I have had a lot of questions from super visa applicants that know they will only want to be in Canada the first time for 4,6 or 8 months, for example. Online at BestQuoteTravelInsurance.ca you'll find more policies than at most other sites (more than kanetix.ca for example, more than pucherinsurance.com...
So looking at a comparable website like BestQuoteTravelInsurance.ca can help you see which deductible options are available to consider using on the travel insurance policy. Why use a higher deductible? It lowers the cost of the policy. A deductible means that you pay the deductible ($100-$500 or higher) before the insurance company would have to pay out under a claim. If the 12 month insurance policy you choose costs $2000, after six months if you return to your home country, you'll get half you policy cost ($1000) refunded as long as no claims have been made under the policy. So even if you buy a $zero deductible plan, if you have a small medicl expense, you may not want to claim it anyway because you'll lose the refund. So it's better to use a deductible, which can lower the policy cost, when you don't plan to use the insurance for the full year.
On the BestQuote website, there's a page of info on 'Super Visa Health Insurance', and you can get a quick quote to see all the top companies in Canada. The site eliminates any companies which won't sell the insurance for a full year, so depending on your quote request, you may only see 3-4 of the 6 companies (soon to be seven or eight) that are currently on the site. Or, you can always email: admin @ bestquotetravelinsurance.ca with some details on travelers dates of birth and dates for the policy, and a quote will be emailed to you.