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The plaming tubes are all conected.When the cold water run in kitchen the cold water at the shower become less,so with less cold water at the mix cold-hot (the balance is desterb),making the water hoter.Same if you turn on the hot in the kitchen the water will be colder in the shower.

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Q: When using the kitchen sink why does the water in the shower upstairs go hot or cold?
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What causes a water pressure drop in the shower when someone turns another faucet on?

If you assume that the water entering your house in the mains pipe is at a constant pressure (this is a relatively good assumption) then the more outlets you give for it to flow from, the lower the flow rate from each one. Say you are supplied 1 litre per second and your shower is using all of this. Now, turn a tap on to 0.3 litres per second and there is 0.7 litres per second coming from the shower head. Showers are often upstairs and kitchens downstairs, so if the tap in question is in the kitchen then the effect will be greater than if they were both on level. The pressure of the water in the kitchen tap is made larger by the head of water pushing down from upstairs, and when both are turned on, the kitchen tap can "steal" more of the shower's water than a bathroom tap would when twisted the same amount.


Why is water hotter in kitchen and not in shower?

The kitchen is probably closest to the water heater and the shower is the farthest. Water cools down the farther it travels through the pipes.


Where does upstairs sink water and shower water drain to?

There is a main drain that runs from the basement through the roof where it is the vent for the system. If you look at the layout of the house, the upstairs bath is most likely over the downstairs one or the kitchen. If you look on the roof, you will see a 4 inch pipe coming through the roof that should be over the upstairs bath. The sink and shower drain into that and then to the basement and out of the house. Most likely the main stack is in the wall behind the toilet.


Why is the kitchen water draining into basement shower?

Stoppage


What could cause hot water in an upstairs bathtub to trickle but cold water run fine?

Bad shower valve.


Why would you have Lukewarm water in upstairs showertub but have hot water from all other faucets in the house?

Temperature balance shower body needs to be adjusted


What is the cause of downstairs shower and floor draining backing up?

The main drain is plugged. Not completely, but enough that it is easier for the upstairs water to come out in the shower and floor drain instead of going out the drain.


What causes one bathroom upstairs to have very little water pressure in the shower and bathtub but the other bathroom has plenty?

Insufficient water pressure or incorrect pipe sizing


How do you fix an upstairs bathroom shower leak and should a professional do it?

You should let a professional do that, incase there is more damage that you can not see that the water has done.


What can you do if you turn the water off on the main floor underneath the toilet can you use the bathtub upstairs?

Unless it is a very strange arrangement, turning off the toilet on the first floor should only shut off the water to that toilet. It should have no effect on the upstairs shower.


Why would a 2 story house with 2 water heaters have hot and cold water in the downstairs bath but only hot in the kitchen and no water upstairs?

it sounds like there are crossed lines. if there is no water upstairs there has to be a valve that is off. even if there is low pressure it would eventually fill the line and you would get some water.


Why would cold water run up through a shower pan even though there is no drain blockage?

Do you have an upstairs tenant or the sewer is backing up.