I recently changed my water heater and have discovered that my water pressure is VERY high. Upon completion of the installation, I noticed the T & P valve opened. I installed a pressure gauge on an outside hose bib to find my pressure running between 150 - 160 PSI. I have a pressure reducing valve on the main inlet line and attempted to lower the pressure. All this accomplished was to lower my flow to an unusable level. The pressure would still rise to the 150 level over a longer period. I have installed an expansion tank in the main line to help with thermal expansion but my pressure still rises to 130 - 150 psi about once an hour. What can I do to solve this problem?

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Originally Posted by ricky3580

I recently changed my water heater and have discovered that my water pressure is VERY high. Upon completion of the installation, I noticed the T & P valve opened. I installed a pressure gauge on an outside hose bib to find my pressure running between 150 - 160 PSI. I have a pressure reducing valve on the main inlet line and attempted to lower the pressure. All this accomplished was to lower my flow to an unusable level. the pressure would still rise to the 150 level over a longer period of time. I have installed an expansion tank in the main line to help with thermal expansion but my pressure still rises to 130 - 150 psi about once an hour. What can I do to solve this problem?

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What range pressure regulator is installed. Usually a 75psi unit will work, but then, I have had to install a higher psi regulator to compensate for the 160 plus input. :) nm

You pressure reducing valve is not doing its job. Check or replace it before you start doing too many other things.

Rebuild kits are available for most brands of PRV's.

Sounds like yours could use one.

If you notice lots of mineral build-up in it while rebuilding it, you might consider installing a wye strainer ahead of it.