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.
How to Fix a Shower That Gets Hotter When a Toilet Is Flushed. When a lot of water is used throughout your home, it can affect the temperature controls. For example, flushing a toilet can cause shower water to suddenly scald the person using it. This is not just an inconvenience. Scalding water can be dangerous. The fix is to install an anti-scald faucet in your shower. This device regulates the temperature and keeps other water fixtures from adversely affecting water temperature.