Up to now I've had no problem with the Max-E-Therm heater quickly warming up the spa. However I have turn down the VS pump from 3000 to 2000 rpm and the heater would not go above 82 deg. It showed it was still heating up, but the temp did not change. Starting water temp was 75. I turned the pump back up to the max (3450), and the heater went to the set temp.
Is there a cause and effect with the pump speed?