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

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I have had a PowerStar A125 for about a year and now the water is hot in the beginning and goes cold and then hot again. I have observed the light when the shower is on it cycles on and off. My wife wants me to install a tank again. However, I am not ready to abandon it quite yet.

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  • slamphere32 Jun 16, 2009

    It is in a house. It is for two people only. Your answer is not quite literate enough for me.

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If on a well, you can install a regulating valve in the line to help with this problem. You may have to play with the valve a little to find the right pressure to avoid those highs and lows. I installed a Bosch A125 and had this problem from the start. A little research un-earthed the regulating valve (I think around $25 at Lowe's or Home Depot) and we have had even hot water ever since.

Posted on Jan 11, 2010

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Unfortunately, this is not a great solution, but I think I know what your problem is. I suspect you are on a well or a public water system where the water pressure varies and this corresponds to the hot/cool cycles you are experiencing from your tankless system.
A conventional H/W tank mixes the water and buffers the water temp unless you use all of the H/W. Most, if not all tankless systems have no buffering and the pressure differences cause flow volumes to vary and the corresponding temp drop is not compensated for by your equipment. At the moment, I am not aware of any home consumer tankless systems that do this properly (or at all). My solution that I am attempting at this time is to buffer with a small H/W tank that uses the output of the tankless system and causes the hot/cold cycled water to mix. I have a space problem and do not want to return to a full sized H/W tank. I don't think saves much $ initially (the cost of the small H/W tank and a tankless system), but should save the cost of heating a full sized H/W tank over time. It should save some space as I can wall mount a small H/W tank and gain some floor space.

Posted on Oct 21, 2009

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Had the same problem with mine --one of the igniters was bad. Had to replace it...

Posted on Nov 19, 2011

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This powerstar is a tankless heater? in a house ? I don't think a tankless can provide / respond yhat quikly to jhigh f;oe. that is why the hoot, cold, cycling.. good luck, but if this is a residential installation, Go with a tank.

Posted on Jun 15, 2009

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1 Answer

I have a Bosch Powerstar Ae115 and the left cutout keeps tripping. It has worked great for 5 years. When i reset it, the water gets warm again(never hot as it was before). What could be causing it to trip?


Water leaking into elements. Bad PC board. Undersized breakers. Undersized main panel.
Bosch Powerstar is a computer that happens to heat water.
If your 5-year-old laptop computer was malfunctioning, you would not be surprised.
But for some reason (false marketing by manufacturers?), folks believe a tankless computer is going to last 20 years.
Moreover folks also believe tankless will provide endless hot water while saving money.
The whole idea of tankless saving money is a load of sales-BS that defies physics and common sense.
There are no service manuals... except bosch website has troubleshoot section in product manual.
Call a bosch-qualified service tech.
Go to Lowes and buy ordinary tank heater, and fix your heater today for only $250.
Tank-type electric water heater can be easily repaired and maintained by homeowner to last forever... that is a fact
http://waterheatertimer.org/How-to-maintain-water-heater.html

http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Gene

Jan 12, 2014 | Water Heaters

1 Answer

I have a PowerStar tankless electric water heater, model #44-557710 and it was replaced about 3 months ago. This morning I had hot water and this afternoon I do not. When I call for hot water a red light...


Call Bosch. And exercise your 10 year parts warranty rights.
Copy following link for Bosch power star manuals:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#Ariston
Check circuit breakers, fully off and then fully back on. Test if voltage is at least 80% rating plate on unit. Check that temperature dial is set correctly. Call for service again.
Don't install tankless computer that heats water. You cannot fix this computer yourself, and they are problematic for owners.
Go to Lowes right now, spend $285 and buy tank-type electric water heater, roll it into your house, and save money, since the electric tankless computer heater costs average $100 more per year to operate than tank-type heater for average family of 4.
Tank type heater can be repaired by homeowner same day for $25 using off-the-shelf parts from hardware store. And that empowers the regular guy, and gets you off the junk tankless treadmill.
Gene

Aug 03, 2013 | Powerstar Water Heaters

1 Answer

We need to replace the 6 way terminal on our Powerstar A125 tankless hot water heater due to a loose wire that got hot and melted the terminal at the end. How do you do this. We have the part to rep


What happened to the screws from the old terminal strip?
If it is a different size you need to drill new small holes in the box (not the tank or pipes) and attach it with self tapping screws. Make sure each wire of the unit matches the same wire being connected as the original connections.

Jan 27, 2012 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Electric bill doubled last month, and we've had the Powerstar AE125 tankless electric for over a year. There are no leaky faucets.


There are a lot of other things that eat electricity. Like space heater and using ovens for heat. Heat pump.Central heat fan running all the time. House lights left on. Outside flood lights. Clothes washer using HOT water. Look around real good. It all adds up. Also the power co. may be charging more for "fuel" costs surcharges. Here in GA I'm paying a bit more now to pay for a nuclear power plant.

Dec 26, 2011 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Have the 125. The light comes on on the panel, but water is usually ice cold. Have tried adjusting the thermostat but same results. Open to any suggestions on this matter. Thanks


Any suggestion could include a list of possible problems from bad PC board, burned out element, bad sensor, loose wire, or combination or these.
More information is needed to make a guess.
Test elements for continuity.
Check wires for loose and burned connections.
Open TP valve and test if hot water is available at machine.
If water at TP valve is hot, then problem might be plumbing-related, for example crossover.
http://waterheatertimer.org/Crossover.html

Aug 15, 2011 | PowerStar AE 125 Electric Tankless Water...

1 Answer

My water heater will not put out hot water. I have well water. My unit is 3 years old. The water would come out hot and cold and the started to come out warm, now its not heating at all. Please help.


Might be the flow sensor, these Bosch units have a lot of problems. Just to be sure, you do have electricity going to it and have not tripped a breaker? The specs. also say the inlet water should be 60 degrees at least. take care.

Feb 23, 2011 | Bosch AE125 PowerStar 4 GPM Indoor...

1 Answer

Heater is ae125 is about 2.5 years old no problem until now turned on water and but no hot water light or anything checked breakers,checked cutouts,plenty of flow,still no hot water


Hey did you ever get this fixed mine is almost the exact same thing we've been using ours for about 3 years and today nothing. Thanks for your help.

Dec 07, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

No hot water!!!!!


It is difficult to diagnose tankless water heaters remotely since there are so many variables to take into account. It might be helpful to check the troubleshooting information on your model at boschhotwater to see if a handy solution is available before calling out a service tech. There are PDF's viewable with more detailed information on troubleshooting (flow rate, power supply, inlet temp, graphics, etc.) and they have a tech support phone # which is very helpful.
If the light is on and you still don't have hot water, I would start by checking the thermal cutouts (breakers) on top of each heating module that could be tripped and need reset.

I can attempt to post walk-through if needed.

Dec 08, 2008 | Bosch PowerStar AE125 AE125 Whole House...

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