After following so many recent build projects, I am thinking maybe my heater is too small (Hayward 5hp 140k btu)? We will likely only ever heat the entire pool (34x17 free form; 4-5 feet) for 2 months out of the year but we will use the spa frequently (approx 1-2 times per week). Spa size is 7 foot round. Any thoughts on if I should upgrade before our build?