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this is probably due to improper sizing in your water lines. The lines don't have enough volume to handle everything that's running. Water tries to take the easiest path that it can so if you turn on something that is closer to the water heater or has less bends in the line the hot water will go there. You can increase the line to the tee to a minamum of 3/4".

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20y ago
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13y ago

Put simply, a correctly designed and fitted system does not lose pressure.

I would guess that there is a pinch point somewhere in your system. This allows the pressure to get up to normal when the system is a rest, only to reduce as the water further up the pipe cannot get through the pinch point.

Possibly there are too many bends in the system, each bend reduces the water flow.

If you lose pressure /volume while a faucet is running the cause could be mineral deposits inside the piping. The trouble could be at the hot water tank as many installers forget to install a dieelectric fitting such as a nipple or union

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Q: Why do you lose hot water in the shower when a tap is turned on elsewhere in the house?
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Why is there no water coming out of the shower head when it is turned on and there is water to the rest of the house?

the tap assebly could be cross connected if older shower set


Why is there is a trickle of hot water to shower when the flow is good elsewhere in house?

Did you remove the shower head and check for a flow restrictor or mineral deposits blocking the orifices


What could be wrong if when you are showering and another faucet is turned on the shower water cools?

Its a loss in water pressure to the shower.


Name something you can't do if the water in your house is turned off?

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Why is the water still running in the tub when the shower stem is turned fully in shower setting?

The valve is not be diverting all the water. This valve may need to be replaced.


What should you do if your shower would not turn off after you took a shower and you turned off the main to the house but it kept on running and it slowed when you opened other faucets?

The shower valve needs to be repaired! As for the water not shutting off when you turned off the main that is also needing replacement when it shut of by turning on other faucets you were simply diverting the flow from the leaking main shut off.


Where is the water shut off for a shower in the bath tub?

Outside at the main shut off valve. Showers/Bathtubs do not normally have a shutoff valve like sinks and toilets. The main water valve for the house must be turned off.


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Have you got two single faucets or a single lever faucet? It could be a pressure imbalance or it could just need maintenance


Why do you have to turn on cold water first to get hot water to work in shower?

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May be build up in the valve itself or the shower head.