Bought a house with a very large rectangular pool - 60' x 18' + hottub.... I love it! But it needs renovations and upgrades to systems. Pentair's 800 number is just awful -- husband asked me to find out about replacing our propane MiniMax 400 which no longer works 400,000 BTUs. Also, is there an app that we can use to adjust our new pool equipment remotely? What is recommended?