Why does my new shower faucet have low water pressure?
Emily Wilson
Updated on April 06, 2026
Why does my new shower faucet have low water pressure?
Low pressure in a shower can be caused by several issues such as a clogged showerhead, a worn-out mixing valve, closed valve, leaking pipe, or even a faulty water heater.
Why is my water pressure so low after installing a new shower?
If your home has 3/4-inch pipes and you’ve reduced it to a 1/2-inch shower valve, you will notice a dramatic drop in pressure. If the new tub and shower faucet you’ve installed is in addition to one that was already there, you may have a problem with the amount of water entering your home.
Where is the shut off valve in a shower?
Your shower shut-off valve should be near the supply pipes. If your shower supply lines are in the basement, the shut-off valve should be on the pipe (or pipes) leading up to the shower. To check whether the problem is in the shut-off valve, turn it clockwise for full pressure. If All Fails Call a Plumber to Fix the Low Water Pressure in the Shower
What should the water pressure be in the shower?
To calculate the water pressure, multiply the amount of water in the jug in litres by 10. Your water pressure should be at least 10L per minute. Anything under 10L is considered low pressure.
How can you tell the pressure of a new shower head?
Some showerheads are also adjustable; you determine the amount of water pressure by twisting the head or controlling a small switch on the side. Your new showerhead also most likely has a water restricter inside. Removing this restricter may translate into higher pressure once the head is returned to position.
What should I do if my shower valve is not working?
Remove the cartridge, clear out any obstructions from it and the valve, and turn on the water for a minute to flush out any debris that may still be in the valve where you can’t see it. Make sure you have the shower door closed during all of this – water will shoot out of the valve at your normal house pressure.
If your home has 3/4-inch pipes and you’ve reduced it to a 1/2-inch shower valve, you will notice a dramatic drop in pressure. If the new tub and shower faucet you’ve installed is in addition to one that was already there, you may have a problem with the amount of water entering your home.
To calculate the water pressure, multiply the amount of water in the jug in litres by 10. Your water pressure should be at least 10L per minute. Anything under 10L is considered low pressure.
Is there a restriction on the pressure of the shower valve?
There is no restriction in the pipe. It’s pure copper line in the unit and I can see all of it and only have 2′ of per by the valve. I somewhat solved the issue by drilling out and widening a small hole in the cartridge just a little bit. It’s not perfect but acceptable.