I have a 16 foot round, 5,000 gal intex ultra frame pool. It has a solar cover on it when it is not in use. The pool itself is in shade most of the day - there is bright sun 20 feet away from the pool, but the pool temperature is around 69 degrees.
The pool is not close to any gas lines, so it would cost thousands of dollars to put one in. I only have direct sun from 11 am to 4 pm. I tried a single Game SolarPro XD1 heater, but it does not heat the pool and it only makes hot water for a short period of time. My dog and I need 85 degree water to continue our aqua therapy, any suggestions?