Question about Moen & Posi-Temp Single Handle Shower Or Tub Valve

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Moen posi-temp for shower pressure

I have a moen posi-temp faucet in my shower and my hot water heater is an instant hot(gas) There is not enough hot water pressure coming out of the posi-temp to ignite my hot water to its full heating. I have replaced the cartrige and even tried to flip cold and hot controls. I need to have the flow harder and I know there is a govern on the flow rate but I can't take another luke warm shower this winter. If anyone knows how to take out the water restricter it is what my water heater manual suggests it would help alot. Thanks in advance for your time. Hope help is out there.

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  • toohandy74 Feb 26, 2009

    just with the posi-temp in the shower. for the water from the spout and the shower head. I removed the water restricter from the shower head still a no go

  • margaret smithe Jan 28, 2013

    did you ever get a response re: the Moen faucet, not the shower head? Plumber changed valve but only warm water - not hot. Working with a tankless as well. thanks.

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There is a little "o" ring in the shower inlet that is designed to collapse as the pressure increases, limiting flow. You can safely remove this and then have un restricted flow.

Posted on Feb 24, 2009

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Blame President Clinton and the environmentalist. They passed a law that requires all showers to be low flow.

Try turning on another faucet on the same heater to increase the flow through the heater..

Posted on Feb 07, 2009

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Is this only happening in your shower? Or through the hole house? Maybe you shower head has a flow restrictor in it. Try removing it!

Posted on Jan 31, 2009

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