The Above Ground Pool Heater is the Most Affordable, cost-effective Solar Pool Heater design for Above Ground Pools. Enjoy warm water comfort by heating your pool the solar way. Pool water is fed from the pump to the pool heater where the water is warmed as it circulates through the heater by the sun's energy and is then returned to the pool. Heats efficiently using the sun's rays with no electric or gas connections needed. Multiple heater units can be connected in a series to increase heating efficiency.
The advertising is incorrect it does not warm the water that goes thru it, if you want to warm the water of a medium size pool, you will need several of this so called "pool heaters" at least 4 for a small size pool. I would rather recomend buying a solar blanket, I did and it works much, much, better, mine raises the temperature of the pool's water from 10 to 15 degrees
Pros: Easy to Assemble, Easy to Use
Cons: not big enough to warm pool water on a small size