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Update: I installed the Pressure reducing valve today on my water main coming in. However, after using tankless water heater my relief valve sprayed again and both my pressure gauges (up & downstream)were at roughly 140psi. So I believe the pressure reducing valve is acting as a check valve and...

Thank you for the reply. Yes I will be installing a PRV this weekend. I’m surprised more people haven’t posted about this issue. The DEP told me since the water in my area is pumped to me it can cause higher pressure during off hours. Such as what I am experiencing now, static pressure of...

Hi, my 7 yr old Navien tankless water heater has been intermittently spraying water from pressure relief valve every day or so. I changed the relief valve and it still happens. The manufacturer said to check my water pressure. I am currently monitoring my water pressure for my house with a...