Not getting hot water from new gas hot water heaters.


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Old 01-19-19, 01:23 PM
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Not getting hot water from new gas hot water heaters.

I have a duel 40 gallon tank hot water system that I have just installed. After install I removed the air from the lines at all water locations but, I am not getting hot water anywhere except for the kitchen sink for just a couple of minutes. We have had to turn the hot water on a jacuzzi tub in the master bathroom for a minute, then cut on the shower to get perfectly hot water in order to shower. Leaving the jacuzzi water running just a little after the shower gets hot to maintain temp in the shower. I have now replaced the mixing cartridges on all showers. Following that I cut off the supplys to all my bathroom and kitchen sinks. Still no hot water. I have run the kitchen faucet which is directly above the heaters till it gets cold and gone down to check the pipe temps. What I found was hot water coming out of the hot water heater and at the tee that sits about a foot or two above the heater a very cold supply line that feeds the rest of the house. The third outlet of that tee feeds the kitchen. Pipeing is all correct and exactly like it had been before. I have sent pictures to multiple plumbers and gotten an thumbs up on that. Just for a little more insight there is a new vertical expansion tank in line before the heaters. Any ideas?? I am at a loss for words.
 
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Old 01-19-19, 01:46 PM
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Welcome to the forums.

That doesn't really make any sense. Maybe you could share your pictures here.
How-to-insert-pictures
 
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Old 01-19-19, 05:45 PM
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Pics of inlet

Member supplied pictures.................

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Last edited by PJmax; 01-21-19 at 05:35 PM. Reason: enlarged/enhanced pics
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Old 01-19-19, 08:36 PM
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I don't see any images.

Post images to Postimage and put the link to them here.

https://postimages.org
 
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Old 01-20-19, 06:12 AM
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Something in the jacuzzi could be letting cold water cross over into the hot water line and travel backwards to a junction or tee and then onward to your shower. Maybe also crossing over in your washing machine.

Elsewhere in the house you need to be sure you turn off water using the wall faucets or fixture faucets, not a sprayer hose. The washing machine hookup should be turned off when you are not washing clothes.
 
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Old 01-20-19, 02:53 PM
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So only a few minutes at best of hot water at the kitchen sink?

Was there any change in the plumbing when the new heaters where installed?

Is there a ball or gate valve open that should be closed?

Any chance that the dip tubes in both units dropped?
 
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Old 01-20-19, 04:19 PM
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Waiting for member to send me pictures to upload to this thread.
 
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Old 01-21-19, 04:19 PM
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Follow up

I did not make any changes to the plumbing. Exactly the way it was before I replaced them.
 
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Old 01-21-19, 04:22 PM
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No extra gate valves or ball valves to open in my setup.

yes , only getting hot at the kitchen for a few minutes. That sink is directly above the hot water heaters and is also the first line off the supply lines.
 
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Old 03-21-19, 03:59 PM
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Dip tube

First thing I would do is remove the cold water supply and check that there is a dip tube in place and hopefully it didnt get installed in the hot side. Years ago there was a recall-diptubes were disintegrating causing the water to just be luke warm going out. Hot water naturally rises to top of heater and the dip tube directs cold water to bottom of tank .
 
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Old 03-21-19, 04:05 PM
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Welcome to the forums.

The OP is monitoring this thread so he should respond within several days.
This was posted two months ago and the problem may have been fixed.
 
 

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