Danielle, I could not see where you are from in your little name block. I am assuming you are from nowhere near me so this does not sound like a commercial. First I install solar pool heat: lots of it. installed my first solar thermal system in 1983, so, I have been around this a bit. I don't believe in DIY on homes as they are too valuable to just let a rookie do work on it. I hire pros to work on mine even though I have trucks and tools and employees and we could do most anything. the result is a home which is low maintenance and will hold its value and will be trouble free. Second, most Americans mistakenly buy something for their home based on its first cost: just look above and see no one mentioned life cycle cost. So, for pool solar, Hands down, Heliocol will provide you with the lowest life cycle cost of any solar pool heating system other than their commercial system. I install and repair others if the manufacturer refers them to me. A not so close second place would be techno Solis mentioned above. there are numerous reasons which, only a pro can know after having multiple installs of each to compare. A Heliocol system comes installed with a twelve year warranty on the panels and a servicing dealer who usually warranties the remainder of the system for a year (we do 2) . Heliocol is the largest maker of panels, the design is 30 years olds and works and parts and panels are always in stock. In all the years of doing this I have never replaced a Heliocol panel under their 12 year warranty: I NEVER GOT A CALL FOR IT! I have gotten calls to replace sunbleached Heliocols which were over 15 years old. Yet, with Techno solis, the nature of the beast is such that I do get warranty calls and to their credit they honor their 10 year warranties and send me a new one for the client whom I have to charge for labor. The only calls I have gotten for Solara are DIY jobs gone wrong as the client invariably knows nothing about heat gain, heat loss, and fluid dynamics and is then shocked that they have undersized or underpiped their system, or, that they have pushed their pump past its limit, or, have forgotten a key component (usually the vacuum breaker). So, in order Heliocol then Techno solis and whats available after that in my view is just spending money you are going to have to spend more money or time on in the not too distant future. Thanks for reading Sean