We have a brand new in-ground pool and hot-tub. Big pool- 50x20, big spa, 10x9. We have a big heater too- 400 btu propane heater. However, even when the starting temp of the spa is 81 or so, it's taking over 1.5 hours to get up to 99-100 degrees! I think that's WAY too long. We worked with a "pool consultant" who was incredibly flaky and incompetent so I have a feeling he probably has never installed a spa this large. I'm wondering what kind of heater is used at resorts or public pools/spas? Do they use two heaters? I'd rather have gotten a more expensive/bigger heater that would heat it quicker (30 mins???) so we didn't have to wait HOURS (and I'm worried about winter now!) to enjoy our hot tub.
Any ideas or suggestions would be greatly appreciated. Or is it too late at this point to change/add equipment?
Thank you in advance for any help!!