There may be a lot of reasons hot water heater leaking.
Why is my hot water heater leaking from the copper pipe on the side.
Turbulence enters your system in 2 ways.
If water is coming from the cold water supply line and the hot water pipe you may be able to stop the leak by tightening a loose fitting with a wrench.
To replace the water heater flex lines first shut the water off to the water heater.
If the tank is leaking there must be internal leak of hot water heater.
Put a thermometer in a glass and place it under the tap.
Leaking may be cause by the old pipes or by the water heater overflow pipe of hot water heater pipe leaking.
Before removing the water supply tubes verify that the water is turned off by turning on the hot side of a faucet somewhere in the house to see if water continues to flow.
This valve will open or leak for the following reasons.
Limiting the velocity reduces the turbulence in the pipes that creates pinholes.
Feet per second for cold water and 5 fps for hot water.
The 1 reason why copper pipes leak is due to turbulence.
Tighten loose pipe fittings.
Water leaking from a copper pipe on the side of the house.
This device is intended to keep your water heaters tank from building up pressure and literally blowing up.
Most likely water leaking from a copper pipe or elbow shaped fitting down low is an indication that the prv pressure relief valve on your water heater is leaking.
There are frequent leaks occurring in straight pipe runs.
Or may be leak in the drain pipes of the hot water system overflow pipe water heater running.