I recently had a new water pressure regulator installed on my house on the main water line. Now, the pressure reads a nice 65-70psi. However, I noticed that the lazy arm on my pressure gauge would spike to 120psi. I called my plumber back and told him that the valve must not be working correctly. He said he didn't think so and suspected that my "cheap home depot gauge" was faulty. He left his gauge on (without a lazy arm) for me to check to see if I could ever catch the high pressure.
However, after reading this forum, it gave me a clue that the pressure increase could be due to thermal expansion. And sure enough, I have found that the pressure increases when the water heater turns on. The pressure will spike up to 120psi. Of course, as soon as a faucet is turned on anywhere in the house, the pressure goes back to normal.
I don't believe I have any thermal expansion tank, at least I don't see one connected to my water heater. Should this be something I should consider having installed? I would imagine that during the day, any thermal expansion is quickly dissipated by water use. However, at night I'm not sure if the pressure stays high or slowly dissipates on its own.
Thanks for any input.
However, after reading this forum, it gave me a clue that the pressure increase could be due to thermal expansion. And sure enough, I have found that the pressure increases when the water heater turns on. The pressure will spike up to 120psi. Of course, as soon as a faucet is turned on anywhere in the house, the pressure goes back to normal.
I don't believe I have any thermal expansion tank, at least I don't see one connected to my water heater. Should this be something I should consider having installed? I would imagine that during the day, any thermal expansion is quickly dissipated by water use. However, at night I'm not sure if the pressure stays high or slowly dissipates on its own.
Thanks for any input.