The water from the shower head cools down about 10°C before it hits the ground (go sit down in the shower for once, it gets damn cold). Some degrees gone before it’s washed away. Proteins become solid above 42°C, that’s why you’d die if your body temp goes over that limit. You’re saying you shower in 55°C+ water? Damn, your skin must be so extremity burned after all those showers, you probably look like Freddy Kruger.