Treato found 16 discussions about Cold Symptoms and Cats Allergy on the web.
Best Answer: When the toilet is flushed, the toilet is robbing pressure from the shower, which is usually close to the toilet. As the COLD water pressure goes down from the toilet flush, the HOT water pressure is higher, therefore the water gets hotter as the COLD pressure goes down.
hot water pipe knock. When I turn on the hot water for the guest bathroom sink or shower, I get several loud knocks that eventually stop. It doesn't occur when I use the cold water or flush the toilet and it doesn't occur at the other bathrooms or in the kitchen.