I'm running about 70ft of 6/4 from my main breaker to my gfci 60A spa panel.
I normally only use one element at a time but have begun using 2 - 5500 watt elements ( one in HLT, one in BK) at the same time to heat my water. I think I am good to do this with 60A breaker and 6/4 wire. However, I...