Since I was lucky enough to find this wonderful site before purchasing our pool, would someone be kind enough and perhaps advise what they believe I should get with my first purchase.The pool can be no larger than 18' round 52" deep. I live in rural Manitoba, so a propane heater would be best (or heat pump I'm not sure which to get). The pool will be used almost everyday and must be nice and warm. (being used for therapy). Thanks, I really appreciate it if anyone can help me out.