Hot water lines, 3121RL

[BrianInWisconsin]

I purchased a beautiful used 3121RL Montana 5th wheel and I believe the hot water line from the hot water tank to kitchen faucet might be kinked or crushed. We have great hot water pressure in bathroom and outside but not kitchen. We have great cold water pressure everywhere. You can also hear it hissing a little under floor. There’s no leaking anywhere. How do you access this hot water line? Cut a hole in the underbelly? Anyone ever run into this? Brian

 

[AZ Traveler]

Brian,

First, welcome too the forum!

It is likely a restrictor in the faucet vice a line issue.

 

[BrianInWisconsin]

Brian,

First, welcome too the forum!

It is likely a restrictor in the faucet vice a line issue.

I disconnected the hot water line from the faucet and let it run into a bucket and it still flowed slowly so I ruled out a faucet issue. Am I correct?

 

[Carl n Susan]

There are two restrictors. One at the faucet and another where the pex lines connect to the faucet plumbing.

 

[BrianInWisconsin]

I’m sorry, I don’t see any restrictors. I pulled hot water line from faucet and ran the water and it comes out of hot water line slowly so it’s not the faucet. Is there a restrictor in the pex itself?

 

[Carl n Susan]

No restrictor in the Pex. Your RV may not have a second restrictor that earlier faucets had. It was definitely port of the faucet to Pex connection.

If you have disconnected the input hot Pex line and it still is dribbling, then I am lost. You said the other hot water supplies (shower, bath sink, outside shower) all have good flow. If they all dribbled, I would say to remove the check valve on the back of the hot water heater. It has been known to plug up. But that doesn't fit with your case.

 

[Mikendebbie]

The hot water line run will look something similar to the sketch below. Remove the basement wall panel and look there first before removing any of the under belly. The water lines are run in the insulated floor structure - not in the under belly. You can see the pex lines popping out of the floor structure in the second screen shot from a YouTube Montana factory tour video. Even if you remove the under belly you will not see the pex until you dig thru the batt insulation. Hopefully, if there is a kink in the pex you can find it behind the basement wall.