How do you check water pressure on house?

Answer 1

"look at the little thermometer"

Whoever posted that answer should be blocked from answering questions. A thermometer measures temperature, not pressure.

Most hardware stores will have water pressure gauges, they can be purchased for around $10.00 and may have garden hose threads or standard pipe threads of various sizes. You may have to adapt to attach to something near where you want to measure pressure. If you attach to a hose spigot, remember that pressure is lost from the moment it enters your home until it reaches an outlet. There is friction in piping and pressure loss due to elevation. Try to measure at something as close to where the water comes in to the home, not at a line far away where it is exiting.

When testing the pressure one must do the following1- With a gauge you test the pressure with no flow to give the incoming available pressure

2- Open a tap and watch for a pressure drop, which can be quite severe with ferrous metal piping

3- Then you take the pressure and times it by 2.31 that will give you the height the pressure will elevate the water

For example you have 40 PSI will elevate the water to 92.4 ft to prove it you take 94.4 feet and times that by .433

The friction losses are not that much of a concern if your not working on a high rise building or long developed lenght of piping and fittings non ferrous metal piping or plastic offer the least amount of friction losses

What is a concern is the velocity which if unchecked can cause piping erosion and hydraulic shock (water hammer)

A hydronic boiler gauge is a great tool as it is a tri-indicator giving static pressure , and actual operating pressure as hot water gets heated it expands increasing the pressure thus incoming pressure can be raised considerable when heated