Best Backflow Tests in San Antonio TX

I called Tietze to come examine my water pressure because my tankless water heater was not producing enough hot water. After an examination they determined my water pressure was at -50psi. I asked them to call the manufacturer, which they did, and the tietze tech was told the recommended pressure should be -80psi. When presented with a quote to complete the work i was in total shock -$800! They recommended that i replace the PRV which included trenching and a new line etc. my house is only 3 yrs olds mind you. I called my builder and he told me to grab a pressure gage attach it to the water line outside and adjust the pressure by turning the screw on the existing PRV clockwise. I now have accurate water pressure and it didn’t cost me $800 only a $49 appointment fee (smh). Completely disappointed in this company and hope anyone who uses them does their homework ahead of time or find a different more trustworthy company entirely. Next step is the BBB.