Plumbing Zone - Professional Plumbers Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter #1
Hi all,

problem:

for the last 6 months or so I have started to notice an issue in my plumbing where I would get hot water in the cold pipes. Most severe at the sink right above the water heater and in the kitchen (likely the end of the line).

setup:

I have recirc pump hooked up to the water heater with a dedicated return line. Recirc pump is pumping return water into the drain outlet on the bottom of the tank.

diagnosis and things I have tried:

I have changed out all the mix cartridges at single handle showers and shut off washer machine pipes when testing. Did not help.

I have noticed that the cold inlet of the water heater is hot. When the cold pipes get cleared (running cold water or warm water), the inlet pipe feels cool, as soon as the faucets and showers get shut off, within seconds the cold inlet pipes will get hot again. There is no check valve or overflow tank. The dedic

also noticed that when I turn off the cold water inlet to the water heater the cold pipes do not get nearly as hot.

e sink above the water heater gets the hottest, and even when it eventually cools down, I can feel pulses of warm in the stream.

noticed if I turn off the Recirc pump the cold pipes are much cooler.

I’m thinking hot water is getting pushed up the cold inlet pipe and into the cold water lines. May be caused by the increased pressure from the Recirc pump pumping hot water back into the water heater.

am I missing something? Any help would be amazing!
 

·
Registered
Joined
·
5,468 Posts
.................am I missing something? Any help would be amazing!

This site is only for plumbers so you need to leave.
 
  • Like
Reactions: Tango

·
Super Moderator
Joined
·
8,384 Posts
Since the new forum there's too many diy, I'm running out of jokes and starting to get annoying. I'm about to start deleting some of them or just send them to a forum that's never used like the plumber's swap to keep them together. This constant wave is starting to litter the place.
 

·
Registered
Joined
·
2,175 Posts
Tie the dedicated return line into the hot line,thats the problem you are mixing them together,if you need to plug that bottom outlet just use some hydraulic cement,that stuff sets up like steel,eazy peazy
 

·
Registered
Joined
·
9,983 Posts
Hi all,

problem:

for the last 6 months or so I have started to notice an issue in my plumbing where I would get hot water in the cold pipes. Most severe at the sink right above the water heater and in the kitchen (likely the end of the line).

setup:

I have recirc pump hooked up to the water heater with a dedicated return line. Recirc pump is pumping return water into the drain outlet on the bottom of the tank.

diagnosis and things I have tried:

I have changed out all the mix cartridges at single handle showers and shut off washer machine pipes when testing. Did not help.

I have noticed that the cold inlet of the water heater is hot. When the cold pipes get cleared (running cold water or warm water), the inlet pipe feels cool, as soon as the faucets and showers get shut off, within seconds the cold inlet pipes will get hot again. There is no check valve or overflow tank. The dedic

also noticed that when I turn off the cold water inlet to the water heater the cold pipes do not get nearly as hot.

e sink above the water heater gets the hottest, and even when it eventually cools down, I can feel pulses of warm in the stream.

noticed if I turn off the Recirc pump the cold pipes are much cooler.

I’m thinking hot water is getting pushed up the cold inlet pipe and into the cold water lines. May be caused by the increased pressure from the Recirc pump pumping hot water back into the water heater.

am I missing something? Any help would be amazing!
just fill the sinks with ice cubes, that will cool down the water...
 

·
Registered
Joined
·
2 Posts
Discussion Starter #8
So many options, I'll try them all! Thanks plumbers you guys are a great bunch and a great help!
 
1 - 9 of 9 Posts
Top