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Waterheater does not keep water hot when you get in the shower first thing in the morning you have to turn on only the hot water or the water is cold

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  • Water Heaters Master
  • 5,245 Answers

1) Unknown water heater type, brand and model.
Check for crossover first to eliminate plumbing problem.
http://waterheatertimer.org/Crossover.html

2) Add comment with more information about water heater for possible assistance, and give type, approximate age etc.

Posted on Jan 22, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 3 Answers

SOURCE: waterheater pilot light keeps going out

There are several things that can cause this, but the most likely cause is a dirty pilot light orifice, causing the pilot light to have a smaller weaker flame than it was designed for. This produces a weak flame that is easily susceptable to drafts, and a lower holding temperature on your safety capillary tube that controls the gas shutoff safety valve.
The orifice can be removed and cleaned on some models, removed and replaced on others. I would suggest a qualified serviceman be called, because gas service is usually beyond a typical handyman's area of expertise, and safety is a very important issue here.

Posted on Nov 17, 2008

  • 1 Answer

SOURCE: Water is either hot or cold - no in between.

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

gary1121
  • 332 Answers

SOURCE: I have exactly the same problem

you need to change the cartridge, it is a temp control and is going bad so it keeps you from burning yourself it is like a mixing valve and is givng more cold water, that way you don;t get burned,,

Posted on Jun 21, 2009

  • 82 Answers

SOURCE: Bosch AquaStar 125b ng suddenly goes cold during shower

Does it happen to any other fixture? If not, it's most likely your shower valve and not heater.

Posted on Sep 04, 2009

  • 4 Answers

SOURCE: rinnai infinity hot water service, goes hot and cold...not fun in the shower!

We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Solution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably machanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem,

Posted on May 07, 2010

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1 Answer

I went to take a shower this morning and the water was ice cold. For more than twenty minutes the water ran and never warmed up. Are there common things to check my hot water heater for in this situ


There is an adjustment knob to control how hot the water can become. There might be a problem at the tap (however, if this is the case, you would still get hot water everywhere in the house). If the entire house isn't getting hot water, and the knob is set at the hottest water, you probably need to get the hot water tank replaced.

Feb 04, 2015 | Rheem Tankless Hot Water Heater...

1 Answer

Why do we need to have to continuously adjust the temperature of the water when we're taking a shower. We have a new Rheem gas .hot water tank


It *may* not be a problem with the water heater itself necessarily. When you say "keep adjusting the water temperature when you're taking a shower" I presume you're talking about turning the shower hot/cold knob(s) and not the temp thermostat on the water heater itself.
If so, when it starts to run colder, turn the knob all the way to full hot. Is the water then very hot? If so, the water heater is working fine & doing its job, and the problem is likely to be in the shower faucet mixing valve itself. Sometimes a faulty one will expand the inner seals/cartridge as hot water flows thru it, and starts to (wrongly) restrict the hot water flow, thus causing the constant need to "turn the dial up a notch".

Oct 29, 2014 | Rheem Water Heaters

2 Answers

Heating coils were replaced last december and today no hot water for a shower after 5 minutes in the shower. The electric is flying on the meter. Have shut off the circuit breaker for this hot water


Copy following link for tank-type electric water heater troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#skyrocket

Press reset button located on upper thermostat.
Test elements for short to ground against steel tank.
Clean sediment out of tank. Check for water leak running hot water out of tank.
Replace both thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Nov 25, 2012 | Rheem Water Heaters

1 Answer

Our tankless water heater is about 3 yrs old and when you take a shower the water is so hot it will burn you and when you try to cut more cold on it turns all the way cold we have it turned down as low as...


almost all tankless water heaters have this problem. I would install a small "buffer" tank. for example a small 5 or 10 gallon electric water heater will "mix" the water so that it doesn't come out of your shower cold, or scalding hot.
the instructions that came with your water heater should have a diagram of how to do this. if not let me know, I can send a copy.
the electric water heater acts as a mixing station.
the problem with most tankless heaters is that the water coming in is cold, average 60* and the water coming out is average 120*. sometimes the flame in the unit can't keep up when using large amounts of water, and you will get cold spots. when this happens, the heater will sense this, and then tells the flame it needs more BTU's, so then you will get extremely hot water.
the buffer tank will fix this by mixing the water before it gets to your shower and will give you an even water temperature.

let me know if this helps

Aug 22, 2010 | Bosch Water Heaters

1 Answer

Heats up the rapidly decreases within in minutes.


Problem new or old? How long you have unit? Sounds like not enough flow to keep burner on. Tankless need at least .6 gpm to keep hot water flowing or else the burner fires then shuts fires then shuts and you get a sandwich effect...hot cold hot cold. If you have new diverter valve in shower -vs- old two handle type try turning hot water ALL the way ON and see if hot stays hot. If it does stay hot then slowly adjust to cool and see if you maintain a good MIX for proper temp. If it goes cold again try this......LOWER control pad setting to a comfortable 105 degrees (ladies) 100 degrees(men) and turn shower valve all the way to HOT. See if your temp remains consistant now and if it does then problem solved. Tankless mindset...set temp on control pad and stop trying to MIX at shower valve. Thats how these things work. Thats why I install a control pad in each bath and one in the kitchen for adjusting ash temp during dishwasher on time. ditto for wash machine. You should never need to turn on cold water if your unit is set to proper temp at controller. Hope this helps

May 17, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Warm water only


You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.

Sep 16, 2009 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

At shower time in the morning the hot water varies from cold on one day medium on another and hot on any given day. What's wrong?


Do you share your hot water with anyone? Is anyone washing dishes, laundry, etc before you shower? How old is your hot water heater? If it has filled with sediment, your hot water is limited. Try turning up the heat control valve on the hot water heater, only go up one notch today, then if not enough another the next day. Be cautious of scaulding hot water after turning it up.

Apr 10, 2009 | Water Heaters

1 Answer

Water heater has hot water in it but cold water is still flowing


Nothing wrong with waterheater. Did you perhaps reverse hot/supply lines on new shut off valves?? try reversing lines. Maybe

Please rate. Thanks jj505

Mar 28, 2009 | Whirlpool Water Heaters

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