When opening hot water in shower, there will be noise in the pipes after 30 seconds. Will last about 1 minute and then stop. About 10 minutes after the shower, there will be a couple of bang and none after that.

Do you have a gas hot water heater? Back to you, Tom

Hot water heater Tom.

Please answer the question. Tom

I do have an electric hot water heater.

Please describe the noise. Banging? Squeal? What? Back to you, Tom

About 30 seconds after running the hot water there will be slight banging sound. Like clank and a few more clanks. This will last for about 30 to 40 seconds and then stop.
About 10 or so minutes after shutting down the hot water, there will be a couple of more clanks. Very quite after that.

I have an electric hot water heater system. Is there anything else you need?

I have an electric hot water system. Is there anything else you need to know?