Banging pipes are an annoyance, and they're also a warning sign, because the pressure making the noise is hitting every fitting, faucet, supply line and water heater in the building, and everything it wears out ends up on the repair bill. National City's older homes and buildings have been taking full street pressure for a long time, and the ones whose regulators failed, or that never had one, have been paying for it in extra repairs.
Pressure above the healthy range wears everything downstream ahead of schedule, and the water heater fastest of all, since constant strain can wear a tank out years early, and that means replacements nobody planned for. The PRV handles it at the source, one device protecting everything behind it, and for any older property the question is whether it's working, failed, or missing. All three show the same symptoms, so the answer comes from a pressure gauge.
A licensed contractor measures what the street's delivering, checks the regulator, and explains it in plain English to whoever makes the call. Buildings without regulators hear what adding one protects, which means quieter pipes, fewer fixture failures, and fewer repair calls across the building. It starts with a measurement.
