Question about RTO Atwood DSI-RV Water Heater-6 Gallon

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My water heater on electric is not heating to full hot temp. it only seems to be warm, with periods of cool then back to warm. anyone have a answer for this?

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Most electric water heaters have 2 heating elements. The symptoms you're describing indicate that one of the elements has burned out and needs to be replaced. If you want to try to change it yourself you can contact me back through Fixya.com and I can try to explain how to do it.

Posted on Jun 05, 2010

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Posted on Jan 02, 2017

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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

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2 Answers

I have to turn the hot water tap on full open to get hot water


Type of water heater is unknown
If you have single-handled faucet the faucet cartridge might be bad.
If you have recirculation system, then check valve might be bad.
Copy following links for troubleshoot.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

Jul 16, 2012 | Water Heaters

2 Answers

I have a Powerstar Electric tankless water heater, 45-551301, installed in a new home less than 3 years ago. We have always had minor problems with the hot water staying hot, fluctuations in hot and tepid...


Tankless heater are a little frustrating sometimes but this is generally an issue of waterflow I believe. The fluctuations are do probably to the amount of water and rate of water going through the heater. If you have a shut off valve on the cold side of the heater, shut it back about half way. This will slow the water going through the heater and allow the heater to heat it up more efficiently. Then go to the shower, turn the hot on all the way (no cold) and allow it to heat up. Once it has heated up, test it by hand for a good temperature that you like. If it is too hot, turn the cold on just a bit until it comes to the temp you like. If it is too cold turn the hot down just a little (still no cold) and it will warm up. Ideally you should be able to turn the hot on full blast and then just turn on a little cold to get the right temp. Once you learn how these work then it makes it easier. You really cant run the water like you do with conventional hot water systems and expect to get the same results. Also, wanted to give you another little tip. Every 6 mos to a year, you should flush you heater with vinegar for about 30-45 minutes using a small cheap submerible pump like for a water feature in a garde. Just put in a bucket of vinegar and and run a hose to the "in" side of the heater and another from the "out' side of the heater and then back into the bucket. This will circulate the vinegar inside the heater and clean all the deposits that will DOA your heater. Funny how the manufacturer wont tell you this but these deposits will ruin the connectiosn on the heating elements. You can make your heater last for a long time if you do this.

Mar 27, 2011 | Bosch PowerStar AE115 Tankless Water...

1 Answer

I have powerstar model # 45557701- what causes the cracking noises when water is heating? what will make the unit slow to start to heat? how can i change the heating units?


The crackling noises is just from air in the water and should be of no concern. If you are having a problem of heating up the water with the unit it is most likely do to water moving too fast through the lines. Ideally, there should be a shutoff valve installed on both sides of your heater (makes for easy removal if it needs to be serviced). But if you turn off the valve about 1/4 to 1/2 way on the one on the "in" side of the heater (where the cold water enters) then you will slow down the water going through the heater and this will give the water a better chance to heat up. This should alleviate the heating problems you are having. If you do have a shutoff valve on the cold (in) side of the heater, shut it off about 1/4 to 1/2 way and then go to your shower and turn the hot on all the way (no cold). Wait for the water to warm and test the water by hand to see if it is the temp you want. If it is still not warm enough, turn the hot on the shower DOWN just a little. This will actually make the water hotter. I know this doesnt seem right but it will. On the other hand, if the water coming out with the hot water fully turned on is too hot, then just turn on a little cold water at a time until the water is the temp you want. Remember, always give the water plenty of time to get from the heater to the shower before you decideof its the right temp. Ideally, you should be able to turn the hot water on all the way and get the hot temp that you want and if you want to cool it down, just turn the cold on just a little bit until it is where you want. I'm fairly sure the problems you are having are due to the water going too fast through the unit and once you adjust that and understand better how these tankless heaters work, you wont have any more trouble. They are difficult to get used to after using conventional water heaters and the manufacturers arent very good about giving you these hints so they will work properly. You will need a professional to uninstall and hopefully this will work and you want have to. But if you do, it requires shutting off the water to the unit. Shutting off the pwer to the unit. Unattaching the water lines to the unit and then unattaching the electric lines from the junction box or wherever they are attached. The heater then can be removed from the wall by unscrewing the screws from the hangers which hold it to the wall.

Feb 21, 2011 | Bosch PowerStar AE115 Tankless Water...

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...

2 Answers

No hot water


in and out hooked up right?

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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.

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2 Answers

Whirlpool temp control on electric water tank


Most electric water heaters have 2 heaters - an upper and a lower, each with it's own thermostat. These are readily accessible by removing the screw covers on the side of the tank. Careful - the thermostats have 240VAC on the terminal screws (unless you have a small 120VAC heater) if the circuit breaker or fuses feeding the heater are still on - turn them off before proceeding. After removing the two screw covers and pulling back the insulation you will see temperature (screw) adjustments for the upper and lower thermostats, with a temperature indicating pointer attached to each screw. Set both thermostats to 125 degrees or so. Push the insulation back in place, replace the covers and turn the circuit breaker back on that feeds the water heater. You should have warm water within 15 minutes and hot water within a hour or so.

If the water still does not heat, then you have to troubleshoot to find the problem. With a voltmeter determine if 240VAC is actually getting to the water heater. Remember, the upper element has priority over the lower element, and if the water is cold, the upper element will try to turn on and this locks out the lower element (only one element is allowed to heat at any given time). The lower element comes on ONLY after the upper thermostat is satisfied. Therefore if the upper heating element is burned out you will never get any hot water. If you suspect this, TURN OFF THE POWER TO THE HEATER and take a resistance check of the upper element.

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