I purchased a home with an inground pool in September of 2014. I had use of the pool for 2 weeks before I had to close it for the winter. So I'm new to pool ownership and I am new to TFP. I would like to install a heating system and would like to get some inputs on gas vs. electric. Of course, I have a host of questions I'd like to submit, but thought I'd start out simple. My pool is Grunit, 20000 gal, 21' X 34'. Any suggestions would be greatly appreciated.