we're going with a standalone hot tub but also might look to add a heater to the pool to extend the swim season. It's going to be around a 16-18k gallon pool here in DFW. We'll already have gas run for the fire pit on the same side as our equipment pad so we should be able to utilize that hopefully. Given the existing gas run for the fire pit and our climate, would you go with a gas heater or heat pump? We're going with Pentair on the rest of the equipment but I see the Raypak gas heater gets high marks and it looks like Hayward has a nice heat pump. thoughts? how many BTUs would suffice if we're mainly looking to extend the season in the spring/fall and for taking advantage of times when we hit the low-70s in Feb here in DFW.