My wife bought a paraffin bath.. it has 2 settings, plugged & unplugged, the book says [& I quote] "Low wattage heater, automatic thermostat and energy efficient insulation keep paraffin wax at a therapeutic 130° F." My question is, is it possible to buy/make a temperature controller, because the paraffin in this thing is freaking HOT & burned my wife's hand? I just want to knock the temp down to about 105-110 without cracking the case open & voiding the warranty. Any suggestions would be appreciated.