Question about Water Heaters

3 Answers

Water is either hot or cold - no in between.

I have a Stiebel Eltron DHC 2-10 water heater that I installed in a new house I am building. I have it installed under the kitchen sink and built a little distribution manifold out of PVC that is connected to the hot water line coming from the water heater. There are 3 lines coming off the manifold - 1 for each shower, and 1 for the kitchen sink. One of the showers is on the other side of the wall where the kitchen sink is, so the distance from the hot water heater to the shower faucet and kitchen faucet is about the same.

OK, so that's the setup. My problem is that in the showers, where I have identical Moen 1 handle faucets, the water is either really hot or cold. When I feather the handle back to get the water warm instead of hot, it stays hot until I get to a certain point and then the water turns cold. The faucet in my kitchen sink is a 1 handle faucet as well and it is working perfectly - I get hot, warm, or cold water.

I have taken the cartridges out of the shower faucets and took them apart to check for debris or something that would cause a problem and found nothing. I even switched the cartridges between the two shower faucets to see if that would make a difference and it didn't. I spent a couple of hours trying to adjust the flow control screw on the water heater, as well as adjusting the control valve on the cold water line going into the hot water heater. I turned the valve to restrict water flow into the hot water heater, and adjusted the flow control screw in the hot water heater. I did this while the water was running in the shower and I made every adjustment I thought possible to nothing works.

My thought is that either my shower faucets are faulty which doesn't seem likely, or somehow the holes in the shower control valve for the hot and cold water are so small that when I turn the handle to a certain point it is almost closing off the hot water side and signals the hot water heater that the line is closed, but that's just a guess. Any ideas of what the problem could be?

Posted by on

  • 6 more comments 
  • brad936 Nov 29, 2008

    The cold water connections come from the same source for the faucets. I built a cold water manifold that is connected to the incoming water line and I have a line coming off the manifold going to each fixture. I think I may have solved the problem today. After trying to adjust everything, and exchanging the innards of the 2 shower faucets with each other to see if it made a difference (it didn't), I thought maybe the problem is with the sensor in the hot water heater.

    I figured that maybe when I tried to feather the shower control to get a little cold water mixed with the hot so I would have warm water, that when I get to a certain point it is shutting off the hot water line enough so that the sensor in the hot water heater wasn't sensing the demand an shut itself off. So I figured I had to find a way to keep demand in the system so the hot water heater would stay on. I went to the kitchen sink and turned the water on all the way hot. I didn't have the pressure/volume all the way on but had the handle all the way to the hot side and waited until hot water was running in the sink. Then I went to the shower and turned the water on and when it got hot I started feathering the control to the cold side and I started getting warm water. So either I got real lucky or my theory was correct. So now I have to keep the hot water running at another fixture in order to keep demand in the system when I take a shower.

    If I'm right, is there a way to adjust the sensor in the hot water heater so that it will keep running even when the demand is extremely low as it seems to be in the shower?


  • brad936 Nov 30, 2008

    Oilboilerman, thanks for your answer. My water heater is a Stiebel Eltron DHC 2-10 and it is brand new. I had the same model in my old house and used it for four years with no problem. This model is the bottom of the line model so there are no temperature controls or settings. I have adjusted the flow control screw all the way in and then all the back out (in small increments) to see if that would make a difference and it did not. The only time I can get warm water in the shower is by leaving the hot water running in another fixture to create demand in the system.

  • dlpm Feb 23, 2009

    I hve the same problem as brad936

  • gav72 Mar 22, 2009

    I have a moen turn facet in a shower stall on the second floor. I also have a direct hot water system from an older weil mclain.  all of the facets and showers have warm water cold water and hot water when turned in the proper direction. My problem is on this shower in the upstairs bathroom. I turn the water facet to the left thinking it would be warm to hot. But instead it is ice cold. when I turn to the 12 oclock position its off. When I turn to the right it is a constant scalding hot temp.  Not sure what to do. I tried taking the facet apart to see if there were any adjusting screws but found nothing.  Any suggestions?   I am currently in the process of piping a Buderus boiler and indirect tank to replace the old Weil Mclain but dont know how to resolve the water issue in the one shower stall. Need help Please!!!

  • larry rosen May 11, 2010

    where r the cold feeds to your showers coming from?

    are they coming from a storage tank or from the same source as the faucets?

  • Anonymous Mar 13, 2014

    need to open the hot water flow 1995
    sea breeze

  • Anonymous Mar 13, 2014

    No hot water when taking a shower

  • Anonymous Mar 24, 2014

    All water in house is either too hot or cold not in between. Kitchen sink does not give hot water

×

3 Answers

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

Posted on Nov 29, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have the same problem in with my shower faucet. My solution is to use a bucket. First fill half ice cold water and then remaining half with scalding hot water. This gives warm water. You can use a mug to finish your shower (I don't know what else you call it). This also saves water.

Posted on Nov 07, 2012

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 17 Answers

This indicates that perhaps the temperater is as you thought flow regulated. the more the flow the lower the temperature.
this could also indicate a lack of linear controll in the heater unit (i wonder how old it is) if the unit has two heat settings ie high and normal/low try setting it to a lower input wattage.
here in uk we normally have 2 settings 4 kw and then watever the maximum is
if you wish give me the exact model no and age etc. and i will contact manufacturer on your behalf and ascertain problem

Posted on Nov 30, 2008

  • larry rosen Nov 30, 2008

    k you can get new items defective lol i will contact them on your behalf and check with tecnical

×

5 Suggested Answers

  • 234 Answers

SOURCE: Sensor broken - E 71 - Stiebel Eltron WPF water-water heat pump.

I would check the connect first may sure it is not loose.

Posted on Mar 14, 2009

  • 2 Answers

SOURCE: my water heater water not warm enough

You may need new heating elements or you could have a thermostat bad as well.

Posted on May 11, 2009

  • 7 Answers

SOURCE: Where do I find the reset button on the Stiebel

On the Tempra 29 there is a "safety thermal cut-out" on the top of each of the heating elements within the box. I have had to open it up before to push the breaker. They are a small red plastic push button on the top. Carefully press the braker button without touching the electrical wiring inside. I hope that works for you.

Posted on Jan 03, 2010

SOURCE: The water heater "Stiebel Eltron

I am a free answerer, and I specialize in giving you resources for free
The paid answerers may have a person who knows your product and the problems associated with your model.
I believe they offer a refund if the 'fix' doesn't work.
The manual might also have troubleshooting.

Each day I see 20-25 unanswered questions about tankless water heaters.
And the day before, there were same number of unanswered questions about tankless products.
The number of questions shows the complexity of the machines, the brand-specific-ness of the problems, and the inability of the manufactures to take care of their customers.
If I understand correctly, the manufacturer will refer you to the installer.
There are not many ways a do-it-yourself-er can fix a tankless.

http://www.thetankatwaterheaterrescue.com/forums/forum3/

Posted on Oct 31, 2010

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Stiebel Eltron 221094


Stiebel eltron model 221094 hot water is not as hot as it was before,
only warm water coming through. Do I need to replace unit?

Oct 05, 2013 | Stiebel Eltron DHC 10-2 Electric Tankless...

1 Answer

Eletric water heater not heating up to 125


Include product brand, model and type for best possible answer.
Include if this is new installation, or installation that worked before and stopped working.

Oct 03, 2012 | Stiebel Eltron Stiebel TEMPRA24PLUS Eltron...

1 Answer

I installed a dhc tankless heater, but when I open only the hot water everything is ok, but when I open the cold water at the same time the heater turns off.


Hi and welcome to FixYa, I am Kelly.

What is happening is that your cold water flow is greater in volume (gals per min) than your hot water. So when you open the cold water it is mixing with the hot water inside the faucett or shower plumbing and actually reverse flowing back into the hot water heater plumbing. The reverse flow slows the water flow sensing turbine inside the heater and it is thinking that there is not any water flow. (There isn't actually due to the equalization of water pressure when you open the cold water faucett) Since this is a safety feature of the tankless heater to keep it from overheating, it shuts off.
Somewhere in the hot water plumbing there is a major restriction. It may very well be the internal plumbing of the tankless hot water heater or the flow detector design.

There are 2 ways to correct this. The easy way would be to restrict the available cold water flow. You can do this by installing another shut off valve inline with the cold water plumbing and just not open the valve all the way. You would have to adjust the setting so that the hot and cold water can be on at the same time and the hot water heater stays on. The hard way is to locate the hot water flow restriction and eliminate it.
It is possible.... if you have a flow restrictor in a shower head or a screen in a faucett areator that they are partially clogged. Clean any flow restrictors and screens then see how the hot water heater performs before you start modifying plumbing.

Thanks for choosing FixYa,
Kelly

Apr 10, 2011 | Stiebel Eltron DHC-E 8 Tankless Electric...

1 Answer

The safety thermal cut off switch keep cutting off and am not getting any hot water in the shower


There is a short somewhere ... You will have to get the fault fixed so the safety will stay engaged.

Probably not what you wanted to hear.

Apr 05, 2011 | Stiebel Eltron DHC-E 10 Electric Tankless...

1 Answer

Not hot water


click the site then go to costumer service,they might help you.. http://www.pexsupply.com

Mar 26, 2011 | Stiebel Eltron DHC 8-2 Electric Tankless...

1 Answer

No hot water!! For some reason it is not heating the water!?


is the heating element still good. Was it on when no water was running thru it?

Jan 25, 2011 | Stiebel Eltron DHC-E 10 Electric Tankless...

1 Answer

The water heater "Stiebel Eltron


I am a free answerer, and I specialize in giving you resources for free
The paid answerers may have a person who knows your product and the problems associated with your model.
I believe they offer a refund if the 'fix' doesn't work.
The manual might also have troubleshooting.

Each day I see 20-25 unanswered questions about tankless water heaters.
And the day before, there were same number of unanswered questions about tankless products.
The number of questions shows the complexity of the machines, the brand-specific-ness of the problems, and the inability of the manufactures to take care of their customers.
If I understand correctly, the manufacturer will refer you to the installer.
There are not many ways a do-it-yourself-er can fix a tankless.

http://www.thetankatwaterheaterrescue.com/forums/forum3/

Oct 30, 2010 | Stiebel Eltron DHC 10-2

1 Answer

Tank rattles when hot water drawn out of any tap in the house.


sounds like water hammer 1/cold inlet pressure to high2/ loose pipes 3/ silicone washer check ballvalve washerand replace or cold water tap washers best of luck

Sep 26, 2009 | Stiebel Eltron Tempra 24 Electric Hot...

Not finding what you are looking for?
Water Heaters Logo

Related Topics:

2,446 people viewed this question

Ask a Question

Usually answered in minutes!

Top Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers

Brad Brown

Level 3 Expert

14405 Answers

Gil Shultz

Level 3 Expert

3320 Answers

Are you a Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...