There’s too much water pressure Otherwise hot water will flow into the cold water pipes. Many experts believe that such a problem may be due to the thermostat in the immersion heater. The thermostat can fail and this leads to hot water overheating and boiling over into the cold-water tap, making the stored water warm.Click to see full answer. Keeping this in view, why is bathroom tap water colder?In the bathroom, the water is often very cold because the person getting a drink first uses the water closet (toilet) and flushes. This starts the flow of cold water. Then they wash their hands, which continues to flow the cold water. By the time they take a drink, the water is nice and cold.Likewise, why is toilet getting hot water? A: The main reason you may have hot water in your toilet is a bad flapper in the toilet tank or a bad fill valve. Either one of these can allow the water to seep into the tank. Correspondingly, why does no water come out of my hot tap? If no water, or a spluttering supply, comes out of the hot tap when its opened, the likely cause is an air lock. Turn on the hot water valve and then the cold water valve. This will now allow the greater pressure of the cold water to push any air back up the hot water pipe.Can u drink water from bathroom tap?Drinking water straight from bathroom taps poses a health risk. Despite advances in sanitation worldwide, there are more than 180 countries where tap water is considered unsafe for tourists. In these countries, it would be doubly unsafe to drink water from bathroom taps.