Forget 75°, just 65°C (150°F) will give you third degree burns in 2 seconds:
Most adults will suffer third-degree burns if exposed to 150 degree water for two seconds. Burns will also occur with a six-second exposure to 140 degree water or with a thirty second exposure to 130 degree water. Even if the temperature is 120 degrees, a five minute exposure could result in third-degree burns.
(°F)
To be honest three degrees burn doesn't sound bad. I'm looking at my protractor and as long as you aren't far away from the tub three degrees shouldn't burn that much