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Matt
 
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We do not have pressure valves on our shower and yet we don't have the
problem. Further this shouldn't be an issue. Hot water only flows
out of the tank when cold water is flowing in. If you flush the
toilet, overall water pressure should be reduced. If your house water
input is strong enough when you flush the toilet, you should have a
surplus of water to continue the cold stream to the shower AND the
toilet. However, if your water pressure is too low, when you flush the
toilet it will divide the water in half, and you'll end up with hot
water and not enough cold to counter it. The solution is to increase
the feed pipes going to your bathroom.

Alternately (and I like this solution).. I turn the heat on my hot water
heater down to the point where I only need to use hot water (not cold
water) during a shower. Not only does this eliminate the ability to
scald the person, but you also use less gas/electric to heat the water,
as it is not scalding temperature. If you need to add water to cool it
down.. it is too hot!

wrote:
This is something that's been bugging for a long time.

Lots of times on TV, there's a person in the shower, someone comes and
flushes the toilet and the person in the shower starts screaming and
freaking out.

Why does the person in the shower react that way? Is this some special
reaction that was invented for TV purposes or something? I decided to
take a hot shower and have a relative flush the toilet and the only
thing that happened was the water pressure dropped slightly, no big
deal. Nothing else happened. So why do all these people on TV freak
out?
I probably wouldn't normally post such a silly question but that new
commercial I keep seeing about flushing the toilet while someone's in
the shower is starting to irritate me. I just don't get it.