Every SpaNet™ SV controller features a variable heater so the amount of power supplied to the heater can be adjusted.
Please check the user manual that came with your spa to determine the C.LMT (current limit) settings for your SV controller.
Please note: The C.LMT (current limit) setting ONLY affects the power draw from the heater. It does not govern or restrict the amount of power that the pumps or blower use.