If you’re in a cold environment, the water that’s been sitting in the pipes in the house will be warmer than the water coming in from outside the house. If the sink/toilet/whatever increases water usage, that warmer water gets used up more quickly.
Water chills the body about 25 times faster than air of the same temperature, so even a 1-2 degree temperature change can feel like a LOT when it’s sudden.
If you’re in a cold environment, the water that’s been sitting in the pipes in the house will be warmer than the water coming in from outside the house. If the sink/toilet/whatever increases water usage, that warmer water gets used up more quickly.
Water chills the body about 25 times faster than air of the same temperature, so even a 1-2 degree temperature change can feel like a LOT when it’s sudden.