Pressure relief water heater drain pipe

[Brother]

I don't believe there is one, but just checking to be sure. Is there a maximum length a drain pipe can be run from the water heater pressure relief ?

This pipe is running to the exterior of the building, and the total length is 27 ft. from the water heater. other than that its ok.

 

[Dj2]

In many places it's code to run it (in metal pipe) to the exterior, 6" above grade.
As long as you maintain 1/4" drop every foot in length, the distance can be 27 feet.

 

[Sponsor]

 

[hj]

HOW it is run IS important. The length of the pipe is completely irrelevant.