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. Anti-scald valves prevent discomfort in the shower. Since the mid-1990s, housing codes have phased out old-style shower valves in favor of anti-scald valves that protect you when a toilet in the house is flushed.