Quote Originally Posted by BigSplash
How deep is your pool, and do you use a solar blanket?
Does the temperature fluctuate at lot?
How about when it isn't sunny for a few days does it cool down rapidly?
How late into the season were you able to use it?

Thanks for your help!
Hi again, The pool is 22'x44', (~60K gal) It has a short 4' shallow end and drops off quickly to 12' at the deep end. It's a sport diving pool so it is set up with straight walls and equiped with a competition 1meter 10' board.

I do use a solar blanket at night to hold the heat in. This is a neccesary requirement. During the day I get best heat absortion with direct sun on the water.
Once the pool is up in the eighty's it holds that temp very well. I may loose 1-2' overnight. If there is no sun for a few days, again I only loose 1-2' per day. Actually mid summer the temp was up in the 90's, way too hot for my liking. Forcast for this summer is very hot and dry so you can expect lots of sun.
The only reason I'd get a heater is if I wanted to swim in early May or Sept.
The rest of the summer a heater is totally unneccessary.