Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...

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Only goes on when I put hot water on full blast

When I try to get warm water with less volume the water heater turns off, I have to tun it on full blast to get continuous hot water.

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Hi, i expect the problem to be because the flow switch which activates the heater wont switch the heater on as it requires a certain amount of water to activate the flow switch & then bring it on.
It may also be thatthe sensor on the flow switch is scaled up so it needs a greater flow to keep the heater running?
Sensor or flow switch may need replacing.

kindly

Richie

Posted on Dec 16, 2008

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Water only stays hot for about 5 min or


Gas or electric?
Electric water heater ... then test for crossover, check for water leak, replace thermostats, test elements
Gas water heater ... test for crossover, check for water leak
http://waterheatertimer.org/Crossover.html

http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html


http://waterheatertimer.org/How-to-test-water-heater-element.html

water leak: turn off all taps and put ear against pipe and listen for water leak... check if water meter advances when all water taps are off.

Gene

Oct 09, 2014 | Water Heaters

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

1 Answer

I would like to know the electrical requirements.( voltage and amperage) Does it plug in or is it hard wired? If the power goes out is the hot water also out? thankyou


Are you asking about tankless gas or tankless electric?

You posted under Tankless gas water heater: gas type tankless plugs into standard 120Volt household outlet to power circuit board. You need larger gas line than used for tank-type gas water heater.

If you are asking about volt and amp draw of Tankless electric, then that depends on specific model number.
For example, if each tankless element draws 3500Watts, and unit has 3 elements, you will need 3 additional 20 amp 240Volt circuit breakers. Volts x amps = watts. 3500 watts divided by 240Volts = 14.58 amps. At full blast, this unit would draw 43.75 amps and will cost more to operate yearly than tank-type electric water heater. If unit has 4500 watts elements, then it will draw 56 amps at full blast, and use a good percentage of household power.

Tankless water heaters have no hot water in power outage. This is true for gas and electric models.

Additional resources:
http://waterheatertimer.org/images/Compare-water-heater-parts-650.jpg
http://waterheatertimer.org/pro-n-con.html
http://waterheatertimer.org/pdf/Bradford-White-on-demand-tankless-service-manual.pdf

Aug 04, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

I have a gas Rheem hot water heater.....The flame appears to be on full blast, not just the pilot. I have run no hot water today, so we shouldn't be out of hot water. The water our of the hot faucet...


Sounds like you have cold water entering the hot pipe, or crossover.

(A) Put bucket under water heater overflow pipe, and stand back from scalding water. Gently open and close the TP relief valve on water heater. Check temperature of water to see if heater genuinely has hot water.
It could be the water heater has sediment build-up and is no longer able to heat the water, or the gas thermostat is bad.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

(B) If water heater has hot water, and hot is not getting to faucet, then you have a crossover problem somewhere.
1) This problem can be located at crossover point of a recirculation system, if re-circ check valve has failed.
http://waterheatertimer.org/Water-heater-recirculation-system.html

2) Failure of a single handle faucet cartridge can cause crossover.
Read how to test for crossover:
http://waterheatertimer.org/pdf/Crossover-on-single-handled-faucet.pdf

3) Other causes for crossover are a failed check valve elsewhere in the plumbing system, for example on the pool equipment. Also a failed mixing valve which is usually installed on top of the water heater so that some areas of the house like laundry room receive very hot water, while the kids bathroom receives lower temperature water.

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May 15, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

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

How do I fill water heater


Once the hot and cold pipes are connected to water heater, then open bathtub spout on hot side, turn water on so tank begins to fill.
After tub spout is running full stream without air, then water heater is full and it is safe to turn on the heater.

Turning on gas water heater before tank is full can damage tank.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Turning on electric heater before tank is full will burn out elements. Replace elements.
http://waterheatertimer.org/How-it-works.html

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Mar 19, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

6 gal tank puts out only about 2 gal of very hot water. ADoes the same whether on gas or with electric hot rod.


Have you tried it with both (hot rod and Gas ) turned on at same time? Is tank well insulated? (looking from behind tank.)
Does temperature drop off quickly, or gradually? Did it supply hot water better before, or this is first time you really measured it out? Need to keep in mind that as hot goes out the top fitting to hot lines, cold is coming in the bottom fitting and beginning to mix with hot, which obvioulsy will cause hot to gradually become warm as it enters. 2 gallons out hot tap, 2 gals., at bottom of tank, then mixing as it flows in usually equals, about 2 gal or less of warm, then cold again. Get many complaints of only enough for a short shower when they have 6 gal tank. You can try adjusting temperature up a little to see if it helps. Keep an eye on pressure relief valve dripping excessively as well as shut pump off for 20min-30 min, then turn it back on before touching any taps, to see if it cycles at all, indicating a leak in the system. If pump doesn't cycle when turned back on, no leaks.

Jan 27, 2011 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

My water heater--Reliance 501--model 5 52 ZORT6 FW95--stopped heating the water. What is the most common problem causing this?


Thermostat may be tripped out or breaker tripped that would be the first few thing's to check. If they check out maybe the element's are in need of replacement.
The clue with element's is one will go and the other will follow. The top element goes you would get luke warm water till the bottom goes out. The bottom goes out first you will get a blast of very hot water till the top element goes out.

Check out this link for further information on water heater trouble shooting.

http://www.water-heater-repair-guide.com/electricwaterheatertroubleshooting.html

Jun 21, 2010 | Reliance & Electric Water Heaters

1 Answer

Water is lukewarm. Not hot! Two year old tank, 220 amp is present. Both sides of relay have 220.


Make sure you have power going to elements from thermostats. check lines going to elements.

Luke warm water is the result of an element gone bad most of the time. One at th etop gone will cause you to get just luke warm water and one at the bottom gone will give you real hot and then cold.


The elements are not to exspensive so if it has two you might as well replace both of them. If you just put 1 new one in it will work the old one till it goes.

Cut power off and cut water off to water heater and drain heater, open hot side on any faucet to help it drain. once drained remove element they have a tube type socket at hardware stores for the removal of it.

Put elements in and fill water heater till all air is out of lines before turning power back on. make sure water is flowing out of all faucets before turning power onto water heater.

The reason being is the elements has to be in water not open air in tank or it will blow new ones.

Dec 16, 2009 | Little Giant Water Heaters

3 Answers

When we turn the hot water on, the water is warm but does not heat up anymore than that. We are not getting any "Hot" water, but if it was the pilot not lighting the water would be cold and its not.


there should be a dial of some kind on the front of the water heater that controls the water temperature turning it up a notch or two beyond its current setting should make the water temp hotter

Nov 29, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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