Why is it that when you flush a toilet, a shower will return with hot?

Why is it that if a shower is running, and someone flushes a toilet that has like source in the house, that the shower will draw from blisteringly hot very promptly.

I think I hear awhile back that there's a means of access to stop it now, if so, what is it and how does it work?

I've get a hypothesis, but there have to be someone on here who can tell me the answer.

So how roughly it? Anyone know?

Answers:    The reason lies near the water pressure within the house and the water supply piping. When you flush a toilet or overt a cold water thump (i.e. on the sink or bathtub) cold water is diverted away from the shower. Thus your shower get hot. This is made worse when you have low marine pressure or small supply piping. Current "pressure balanced" shower valves prevent this, they allege a balanced pressure which equates to constant warmth. When there is a drop surrounded by pressure (i.e. toilet refill) the shower hot and cold water supplies are reduced together to state the same warmth - no flash of hot. This problem can also be mitigated with a low flow toilet (diverts smaller amount water) and/or by reducing the size of the water permeate "angle stop" to your toilet. But this works only if the toilet is the merely problem generator. Retail sites like www.kitchenandpantry.com vend pressure balanced valve, angle stops and even low flow toilets.
this only happen when there is hot dampen running through the house. Because both cold and hot are running through the house, when one is missing the other takes its place. So when you flush down the toilet, which is plugged to pick up only cold river since hot water would be a idle away of energy, the shower get filled near what else? hot water. thats why that happen. so take keeping about flushing the number two
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