Just ordered and installed on our small Intex pool. It's been running 3 days and already notice increase in temp. We are very happy with it so far. There are a lot of negative comments about heater but we decided to give it a try. Think negative comments are from folks who expect little heater to work miracles with larger pool. We are very happy with heater! Good price, shipped quick, well built. Negatives are horrible instructions come with it! They include 2 very short hoses. We got 2 six foot pool hoses to use and some adapters reducers from hardware store tto connect the longer hoses to the pool and pump. Longer hoses give more options to position heater. Short hoses that come with it allow little movement. Heater works great with stock Intex pump and water flow is same. Put it on timer so it runs from 7-7 in sun. Would buy again and highly recommend. Our pool is about 1000 gallon.
We live in the Chicago area and decided to purchase this heater in addition to the solar blanket. We noticed a considerable difference with the water temperature. Ideally, it should sit under maximum sun exposure to get the best results. I am also thinking about buying another one to connect to really maximize our very short pool season.