I just converted from 110 to 230. The heater is heating faster no doubt but I think possibly the jumpers are wrong or something is not right because the heater will not go on when the jets are in operation even though we did change things. The jets do oscillate a little at start or when only one person is tub at beginning. At first I thought it was a special jet mode but may have nothing to do. I think it must be something on the circuit board that is not enabled or something on the control panel that needs to be done so the jets and heater will work simultaneously that we did wrong or maybe is broken.