I changed my pressure release valve, now I can not hot water flw in my house.

You mean you changed the T&P valve?

If u are getting no water from your hot water faucet, make sure you have turned on all shut off valves.

Chuck

To replace the T & P Relief Valve you had to shut the water off at the cold water inlet. Make sure the valve's open. When you lift the lever on the T & P valve do you get water out of it? Let me know, Tom

In my camper I get good cold water but on the hot side is very low... now do I or can you clean a hot water heater