Navien NPE-240A tankless - low initial pressure when 2+ faucets open

[steve80]

Had another plumber over, friend of a neighbor... he back-flushed the hot line with cold to get rid of any debris that could have been in the line, didn't make a difference.

Then he increased the pressure on the PRV.... et voila... one of the previous plumbers must have lowered it for some reason.... it was ~30 psi... now it's 60 psi (max is 70) and what a difference, it actually works!

No wonder the hot pressure died when a 2nd tap was open.

 

[Twowaxhack]

Had another plumber over, friend of a neighbor... he back-flushed the hot line with cold to get rid of any debris that could have been in the line, didn't make a difference.

Then he increased the pressure on the PRV.... et voila... one of the previous plumbers must have lowered it for some reason.... it was ~30 psi... now it's 60 psi (max is 70) and what a difference, it actually works!

No wonder the hot pressure died when a 2nd tap was open.

Exactly

 

[steve80]

Exactly

you were right all this time!

i didnt know that was something i could do, but he showed me so i can adjust in the future. i'll go get a pressure gauge as well.