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.
When the cold water pressure suddenly drops because of a toilet flush, the monitor reduces the hot pressure to equal the cold so the mixture remains consistent with hardly any change in actual temperature in the shower. The other side effect of flushing during a shower is the loss of water pressure.