Hot water heater

[rickasbury]

I have a rinker 270 with the 350 mpi. Nice little mini cruiser. It has a hot water heater that runs on shore power but is also warmed by engine coolant, I think.. The motor is a closed system and is a 2006 boat.
I recently replaced the fresh water pump and also a faucet that is in a small sink behind the helm. It is a cold faucet only.
While on a run, I turned that faucet on and it was scolding hot. First thought would be that internally the water heater is done and water is mixing from the engine and going into the water system- but I'm closed cooling so isn't that coolant vs water? It for sure was not coolant. This new faucet also is barley working- all the rest work fine. Someone suggested that the faucet has a clogged screen- i will look but not sure that faucet has one- but it was just installed and worked fine before I went in the water....so am I being told wrong on the coolant not vs engine water? The only water available from the engine would be from the heat exchanger...always something!

 

[alldodge]

I recently replaced the fresh water pump and also a faucet that is in a small sink behind the helm. It is a cold faucet only.

Could be the hot/cold lines go swapped

 

[rickasbury]

So I finally got back to boat. Here are pictures of the set up. I replaced the pump as mentioned but there is no hot water line going through that pump so I have no clue what is going on!
I've attached pictures but I'm also getting error messages on the upload. How foes the hot water get pressurized anyway?

 

[kd4pbs]

If you have a heater that is heating hot water to an even hotter level, then this would explain things. Tap dispenses the hot water before it gets hotter in the water heater?

 

[Grub54891]

Most modern water heaters have a check valve on the intake side of cold water inlet. My total guess is that the check valve may be bad allowing water to flow back into the lines and making it hot? With the water pump on it technically shouldn’t do that. With the pump off there isn’t anything to prevent the water from going where it shouldn’t be.
again, I’m just poking around with a guess.

 

[rickasbury]

Most modern water heaters have a check valve on the intake side of cold water inlet. My total guess is that the check valve may be bad allowing water to flow back into the lines and making it hot? With the water pump on it technically shouldn’t do that. With the pump off there isn’t anything to prevent the water from going where it shouldn’t be.
again, I’m just poking around with a guess.

Thanks- if see i can't post pictures. The wall mounted pump only receives cold water from the tank itself- check that box.
I'm looking at the pictures..feed from the tank to the pump- then the outlet looks like it's goes to the heater as a blue pipe- there is 3 way juncture and a blue pipe goes from the juncture to a red either inlet or outlet. There is a valve in that juncture and it has a wire tie on it- bever messes with it. Very confusing as to the flow of it all...

 

[alldodge]

I've attached pictures but I'm also getting error messages on the upload. How foes the hot water get pressurized anyway?

The server is not allowing any pics, we're reaching out to the tech for help but so far no response

 

[alldodge]

Thanks- if see i can't post pictures. The wall mounted pump only receives cold water from the tank itself- check that box.
I'm looking at the pictures..feed from the tank to the pump- then the outlet looks like it's goes to the heater as a blue pipe- there is 3 way juncture and a blue pipe goes from the juncture to a red either inlet or outlet. There is a valve in that juncture and it has a wire tie on it- bever messes with it. Very confusing as to the flow of it all...

Many boats have winterization valves next to hot water tank. The valves are there so the tank can be bypassed which allows RV antifreeze to be pumped thru cold and hot lines without filling the hot water tank

 

[redneck joe]

We are having pic upload issues currently. Read post #7 on for a work around

File uploads no good again?

Seems for me today, that file uploads are failing in the same way they did back in August of last year: https://forums.iboats.com/threads/photos-not-saving-to-server.773767/ Had it both on my phone earlier and now on my laptop... both were on my WiFi so technically it could be ISP related?

forums.iboats.com

 

[rickasbury]

Hot water and water heater

I recently replaced the faucet behind the helm seat which I don't belive caused my problem but mention it because it was replaced. It only has cold water.

rinkerboats.vanillacommunities.com

If that works...yes I believe that is a winter valve- also reading a good point for water to overwhelm old seals. No other visable check valve ... also, it only happens when the engine is up to temp.

 

[Grub54891]

Many boats have winterization valves next to hot water tank. The valves are there so the tank can be bypassed which allows RV antifreeze to be pumped thru cold and hot lines without filling the hot water tank

Yes, I've winterized lots of them over time, and added that valve. But if the heater is bypassed, there should be no water in the tank, and you would not get any hot water at any faucet at all. Now if that lever is zip tied in one position, that leads me to believe there is something wrong in the tank. Perhaps it wasn't winterized properly in the past and the heating coils are leaking the fresh water into it and causing the issue.
Had one several years ago that the pump would run every few minutes, Looked for leaks and replaced the pressure valve, still did it. Found out it was the coils themselves that had the leak.