I am downsizing my tub from an arctic 6 person tub to a artesian Santa Cruz tub. The old tub required a 50amp GFCI and circuit breaker. The new one requires a 60amp. It seems most tubs I've seen (even tubs with equal pumps (2 3HP) or more only require a 50amp service. Why does Artesian require more? It has 2 3hp pumps and a 5.5kw heater, and circulation pump. thanks