solar pool heating

Hopefully you'll get some replies from people with more intimate technical knowledge, but as an owner of a unglazed, black plastic solar heating system, I would encourage you to go with the more expensive glazed panels.  Although the unglazed panels work fine, and overall I am very happy with them, the truth is they take up a lot of space.  As I understand it the glazed panels are supposed to be more efficient, so you won't need to have as many square feet, or you can get more heating from the square footage you have.  The downside, of course, is expense.  The unglazed are a lot cheaper, so you might want to just compare the price and maybe that will make up your mind for you. 

I have approximately 450 square feet of the unglazed panels and a pool that is 35,000 gallons.  If anything I would consider the system to be a little bit overpowered.  I barely have to run it in the summer (4 hours per day max), and can easily maintain my preferred swimming temperature of 94 degrees for 7-8 months a year.  In addition to the solar panels, I also use a bubble cover, although primarily to prevent water/chemical loss, and only secondarily to help maintain temperatures. 

I don't know where you are, but this is in San Diego for climate comparisons.  If I were willing to settle for water in the 80s, I wouldn't be surprised if the pool would be swimmable for at least 10 months per year.  I've actually had the pool at 99 degrees one time before, when I decided to test the system.  I think it could have gotten even hotter, but I didn't want a 35,000 gallon jacuzzi. 

Anyway, the black unglazed collector panels should be more than adequate for your purposes.  If you want to save space, considering the glazed panels may be worthwhile.