I am going to wire an older hot tub it is a sweetwater lx-15 model the control panel in the tub says 24/40 amps do I need a 40 amp breaker at the main box and a 40-60 gfci outside or can I use a 60 amp in the basement at the main box the tub has two(2) pumps and a 5.5 kw heater thanks for any answers