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Code allows your plumber to supply three fixtures using 1/2 tubing. In most bathrooms, you only have three fixtures (tub/toilet/lavatory). So most plumbers only run 1/2 pipe to supply the bathroom. Code allows this. Personally, I find this layout a little short-sighted.

Anyways - when someone flushes, the toilet requires water to refill. Which means your shower is now sharing that water supply with the toilet as the toilet refills. What I love best is when you re-adjust the shower valve...then the toilet quits filling...and you scald yourself. Lots of fun there.

Your problem is caused by poor Plumbing (my opinion) or if you are in an older home, galvanized pipes tend to corrode from the inside which only makes the condition worse.

If you like to do things yourself, carry over a 3/4 line and pull 1/2 take-offs for each fixture and the problem will be solved.

In a straight : When you shower you are using both hot and cold at the same time and when you flush the toilet you are causing the homes cold water to be guided more through the toilet line including the cold water that you are using from the shower line.

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If a few words, water pressure and flow are inversely related. The more flow you have, the less the water pressure. Since the toilet and shower are connected to the same water supply line, when there is flow into the toilet, it takes away from the shower. Since cold water is used to supply the toilet, it takes away from the cold water flow to the shower. With the same amount of hot water flowing, the temperature of the water in the shower will get hotter.

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8y ago
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9y ago

Because by flushing the toilet while using the shower, you have removed some of the water pressure on the cold side. This decreases the amount of water flowing to the shower head. Therefore changing the mix more toward the hot side.

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this is also due to incorrect pipe size installation of cold piping. increasing the pipe sizing will solve the problem

Installing a "pressure balanced" shower valve will fix the problem as well.

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12y ago

It is not more hot water flowing, it is less cold water flowing. Less cold water in the mix makes the resultant water hotter. Less cold water flows because half (guesstimate) of the available cold water is now diverted to fill the toilet.

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14y ago

Pressure drop THUS you need a pressure balance type shower body such as a Delta monitor scald guard

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Q: When you flush the toilet the shower water gets hot why?
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When flushing toilet the water coming out of shower head get cold or hot?

This is not an uusual as when the toilet is flushed more cold water is drawn usually from the cold water pipe that suplies the shower with cold water so generaly the water under the shower gets hotter. The only way to stop this from happening is to lay an extra pipe all the way to the ater suply point, or fit a pump to maintain the presure


When in shower if a toilet gets flushed water in shower turns ice cold what causes this?

Incorrect pipe size installations


Where does the water you flush trough the toilet go?

The sewage system underground is where it goes o oh wait it also gets filtered #(


Plumber problems the drain makes gurgling sounds when you flush the toilet and the water goes down in the toilet when the other toilet gets flushed?

either the vert is plugged and there is no air getting through or there is no vent at all


What is it called when a kid gets his head dunked in a toilet then they flush it?

That would be a swirly.


What is the fix for when you flush the toilet while in the shower the water gets hot?

New pressure balance faucet or you can install a pressure balance valve in the water lines behind tub or if you have a crawl space you can install it on the water lines there. But install only too the lines to tub faucet. And they are not easy no matter where you install. I would just tell everyone not to use any water till you are done with shower.


Why when you Flush hot water gets hot in sinks and showers?

When you flush your toilet, cold water is used, this diverts cold water from the sinks and showers, resulting in diminished cold water flow momentarily at the sinks and showers, so, less cold mixed with hot, = hotter sinks and showers.


Is a toilet electrical?

No. the average toilet used is mechanical and uses gravity to flush. e parts need to be in p-top shape hen the Toilet Gets Flushed e easiest way to see how the whole system orks together is to flush the toilet with the lid f. That still leaves the question of how it al nctions. It is actually pretty simple. the flush lever to rise up pulling the chain with it which makes water rush down into the bowl evel lowers enough that it drops back down over the flush valve the refill valve and allows new water into the tank. Th water is coming in much more slowly than the water going out so it doesn't interfere with the flapper


How does flush carl hiaasen end?

it ends as the boy ( i forget his name) and another dude put die in the toilet and flush it to show the trail. they call the coast guard and the guy gets caught


What if a dog gets into a toilet and eats poop?

Ewww..flush your toilet. And for heaven's sake don't let the dog lick you on the face for a while. Like, a l-o-n-g while.


Why would you replace a toilet flush valve?

You would replace a flush valve or 'flapper' when it gets distorted or leaks slowly as they all eventually do. Take it out and go to Home Depot and you will see many better ones than there were when your toilet was made. Average cost $6-10.


Why do all of these small air bubbles like an Alkaselzter tablet keep flowing into the toilet after I flush it?

Small air bubbles in the toilet after you flush could indicate a clog. The clog may not yet be big enough to stop the toilet from flushing but you should take care of it before it gets worse. You should get an auger to clear the clog.