Why does the temperature of my water change so much when I take a shower?

Here's the deal it is called water pressure, your valve says I want X amount of flow, this is between hot and cold....UH oh next door just flushed, You are probably on the same tap from the street but on different meters, this will cause your flow to reduce and since the hot water is more noticeable you will get a hot surge then when the other water stops flowing you will get an inrush of pressure increasing the cold..

The answer, If you have a hot and cold valve, try opening them just enought to get your temp, this will reduce the shock factor. OR you can go out and get a valve, DELTA makes a cheap one that will sense this and compensate at the valve to eliminate the shock factor. I had a similar issue in my house put one of these in and problem solved.. Good luck.

Oh if you have a single valve you can go to the super home center and get new guts for the valve and that also may be your issue, the seals are worn and allows the cold/hot to pass on to you at extreme amounts.

There are regulating mixing valves for the bathe which will immediately experience that the temperature you chosen isn't what's popping out. If the chilly water is getting used for flushing someplace else interior the domicile that drop in incoming chilly triggers a valve action that places in much less warm to maintain the set mixed temperature. maximum modern-day showers contain that (aside from incredibly inexpensive ones). you may want to have the previous bathe mixing valve bumped off and the thermostatically-controlled one put in. that's probably a job regarding commencing partitions and removing tiles so that's in simple terms not inexpensive to do.

are you sharing a water heater with other townhouses? that is probably why. if you have your own, check it out and make sure it is big enough for your house and make sure it is heating properly.