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Thanks for all the help

Replaced the PRV and problem is solved

Never figured out why the noise started at 4:45 and ended at 5am but it is gone now.

CJ

I have had my first break wrt a possible culprit. I put a pressure guage on my on my hose bib and it has a 40 -50psi flow or residual presssure and then after the water is shut off the pressure...

It is obvious that I need an expansion tank, but I am not sure that the increased pressure in the closed system is making the noise.
The question is why is it only happening a 4:45 and for only 15...

I have an icemaker that I turned off manually and I also turned off the power to entire house while the noise was happening,, no change.

I will turn down the water heater to its lowest setting...

The water heater is gas and it is not running when noise is happening.
I do not have an expansion tank so apparently I do not have a PRV. What I assumed was a PRV is a valve right after the house...

Thanks for the reply.
The drip system is the irrigation system.

Do not have a water softener

I believe I do have a PRV where the city supply enters the house. I tried to adjust it while the...

Tried to figure this one out in the archives but have failed so far.
At 4:45 every AM for about 15 min the pipes are tapping about once every second. It stops only when water is running or the main...