Question about Bosch & Tankless LP Hot Water Heater

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Water will not stay a constant temp. One minute HOT next cold. Keep trying to adjust knobs. Confort II My house was destroyed in a flood a couple of months ago. I live in Mexico. I switched from the electric hot water tank to the Bosch Confort II. So far can not seem to regulate the temp. I has to knobs and it just doesnt seem to change any thing when I turn these. I can see the unit come on and the Water is really hot, then seems its quites and the water get cold all of this in seconds Can some help. Give direction. Could this be a pump problem??

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  • 36069 May 11, 2010

    I am not well versed with the LP models, however, if this is a new installation it is possible that the gas line is undersized for your unit. For a natural gas unit, I run a minimum of 3/4" gas line to the unit, depending on distance. If you haven't tried calling bosch, I would do so. They have a technical support team that will be able to help you better diagnose your problem. Without physically seeing the unit, I am afraid I won't be able to be much more help, but I hope this will give you a starting point. The owner's manual will tell what size gas line to run to the unit, and it has been my experience that some plumbers will undersize this line, which will cause the problem you are experiencing.

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Overheat stat fan diaphragm valve microswitch check in that order best of luck

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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...

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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

1 Answer

Adjusting Apollo hot water tank


I am not sure what you are asking, But i am going to assume that you want to know about changing the Temp on the heater for inside the house.
If the floor heat was installed properly than it should have a temperture manifold or adjustable thermostat for seperate heating.
You need to find the thermostat or manifold for the garage heat and set it at what ever temp you want the garage to stay at.
Then you can change the A B C knob to a higher setting A is cold B is warm ac is hot. So Increase your temp setting on the heater and this will increase your house water temp for hotter showers and faucet temps. However, they recommend not setting the temp above 120 degrees to prevent severe burns.
If you have a newer home increasing the Hot water heater temp setting may not change the temp at the shower or faucets if you have scald guard faucets installed in the house. This will require adjusting the scald guard valves on each faucet.
I recommend using a candy thermometer or digital thermometer to check the faucet and shower Temp prior to using them and make sure that you inform everyone in the house after you change the temp so that no one gets scalded.
I hope this answers you question, feel free to contact me if you need more help!
DR Wilkins

Oct 15, 2013 | Water Heaters

1 Answer

Rheem NatGas hot water heater model 41V50, basement flooded pilot went our how do I relight?


At the controls there should be a knob that says " Pilot"... "ON" Turn the knob to pilot and hold it down while lighting the pilot lite. Keep holding it down until it gets warm enough that when you leave it up the pilot stays on. Once the pilot lite stays on on it's own turn it to on.

Mar 14, 2011 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

I have the exact same problem, house is only 6 years old, two handel faucet, Ive turned off the cold side to eliminate it, turn on hot and have to run at full blast and it takes a full 10 minutes to get to...


You have a clog in the water line?
Or a faulty check valve or mixing valve?

Add a comment and say how you fixed the problem, or add more information about size of pipes.
It seems like the cold water is getting into the hot water line somehow. There is no other explanation, as much as I can see from 800+ miles away.
If you have crossover on a single-handled faucet where the cartridge is bad, that can cause this problem.
Slab house can have plumbing in attic. It can be a chore to drop poly pipe down into walls, but it can be done with angle drill. Assuming walls are 8 foot high and pipes can be easily dropped to sink level where the sheetrock is removed and new pipes tied into sinks and tubs.
This kind of DIY project would take a couple weeks working a few hours each night when temps cool off, depending on size of house and number of affected faucets.
I live in Houston on a slab and ran my pipes in the attic when I built the house. Of course I worry about broken pipes collapsing the ceiling and filling the house with water, which happened to lots of homes one year when temps dropped to 4 below. I was in the painting business at that time, which was a boon to business for a few weeks.

Upvote the help.
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Dec 17, 2010 | Laing Thermotech Autocirc Undersink...

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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

I cant adjust water temp 0n a single handle kohler shower valve


4yrs isn't very long, but I do believe the mixer needs a new cartridge in it. unless you have a loose knob/handle.But I don't thnk so. The temps should change almost immediatley. Have someone change the cartridge. It may need a special tool. If you think you can, do it yourself, the tool comes with full instructions. Make sure it does, consult with the pkumbing person .

Nov 09, 2009 | Water Heaters

2 Answers

Water doesn't stay hot PowerStar AE3.4


Are you using a single lever faucet? The install guide does indicate that you may need to reduce the input from the cold water side to ensure that water stays at a consistent temperature (see page 7 of the installation and service manual). Also, remember, this is a SMALL hot water heater. So if you're running for any length of time at full output, it may not keep up with you (see page 8 of the service an installation manual). I found the manual online at http://www.airwater.biz/images_templ/bosch-water-heaters-ae3.4-manual.pdf.

Jan 24, 2009 | Bosch PowerStar AE3.4 AE3.4 Point-of-Use...

3 Answers

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?

Nov 28, 2008 | Water Heaters

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