Question about Stiebel Eltron CK20E Electric Tankless Water Heater

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Hello, we have a demand water heater that we use at work since it is tankless it is different any the regular repair guys are not sure what is wrong with it . i was told it is a poloma gas model and the problem is that it is not getting hot anymore . i can hold my hand in fornt of the water and not get to hot ,it has been doing this for 2 months now . it lights and fires up as you touch the water and seems to work perfect with the exception of the water is just warm .thanks chris.

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In most of the tankless water heaters the tempature of the warter is controled by the rate(amount) of vlow of the water passing through the unit. Turn down the flow of water going into the water heater and the water that is still passing through will be hotter. Carefully. A little at a time,so as not to be too hot.  

Posted on Jan 19, 2009


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Posted on Jan 02, 2017


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My water heater shuts down in cold weather. How do I fix this problem

Add tempering tank.
Tempering tank made from old tank-type water heater, or small tank heater will passively heat incoming water.

This works because tankless can only raise temperature so many degrees. If water is very cold, tankless cannot keep up, so the sensors shut down the unit.
Passively preheating water... or using a small tank connected to power can preheat water enough so tankless works.
Also delime tankless each year will help remove natural scale that builds up inside tankless heat exchanger.


Water Heater Timers Save Money

Feb 13, 2015 | Water 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:
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.

Aug 03, 2013 | Powerstar Water Heaters

2 Answers

Problems with water heaters

Drawbacks And Benefits Of A Tankless Water Heater System
Consider both the positives and negatives before deciding to invest in a tankless water heater, and talk to a professional plumber for more information on how modern systems can benefit your home. Tankless water heater - modern, updated version of the traditional water heating systems - can save hundreds or even thousands of dollars. They take up a lot of space, they save energy (which translates to dollars saved) and they last longer than the old style heaters.

Tankless water heater:

Water Heater 101:

Energy saving - According to the US Department of Energy, gas-powered tankless water heaters can save a household around $ 108 per year. Electric tankless water heater saves about $ 44 per year.The reason for these savings are rooted in how the system functions. Rather than continue to keep the hot water and the energy loss in the process, a tankless system only heats water on demand. You only pay for what you actually will use.

Add to your house for Value - Any updates you make to your home will produce a bump in value, and add a tankless water heater is no different. A new tankless system is expected to last up to 20 years, while the traditional system only lasted a maximum of 13 years. These improvements will enhance the marketability of your home, if you plan to sell.

High upfront investment fee - A modern system that will definitely cost more than traditional heaters, which may be a drawback for some. While regular water heater will only cost a few hundred dollars, the electric tankless system can start at $ 500, and the gas system will cost at least $ 1,000, depending on capacity and manufacturers. On the other hand, because products are designed to last longer than their traditional counterparts, you can expect an extended warranty coverage in case any repairs needed because of malfunctions.

Output is limited - While the function of on-demand heating is very feature that saves you money, it can also cause you frustration if you have a lot of members of the household. When the water is heating, it is divided between all the hot water faucet open. You may find you can not take a hot shower while washing machine and dishwasher is running, and may have activities involving hot water when appropriate.

Save Space - If you are building a new home and trying to find a space in a utility closet plans to add to the traditional water heater, a tankless system could save you hours of frustration and architects. Tankless systems typically about 20 inches and 28 inches, and 10 inches thick. They are mounted on the walls in the house or placed on the exterior of the house, if properly insulated.This is a significant difference in size when compared with ordinary water heater, which measures about 60 inches and 24 inches. A tankless water heater can provide more space in the laundry room or finished basement to add storage or just expand the living room.

Water Heater Talk Enjoy Endless Hot Water

Oct 19, 2012 | Water Heaters

1 Answer

I have a Bosch GWH 425 HNO propane Tankless Water Heater which began intermittently exploding when demand for hot water occurs.

Call a qualified service tech immediately.
Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.

Aug 14, 2012 | Bosch & Tankless LP Hot Water Heater

1 Answer

Flashes il

Before calling service technician, open following link for Rheem tankless resources including error codes and possible manual.

Read your manual for troubleshooting, advisories and required maintenance.
Tankless are maintenance heavy.
1L means tankless heat exchanger has lime build-up.
De-lime tankless unit.
U-tube has videos for de-liming tankless, but there is more to consider:

De-liming is yearly maintenance requirement.
Tankless are prone to lime build-up
Regular de-liming will not restore full efficiency to tankless unit.
Tankless cannot be exposed to water with more than 11 grains hardness.
Temperatures over 135 can cause minerals in water to harden on metal surfaces of any water heater.

Also clean Tankless water filter each month, and clean and maintain burner and combustion chamber yearly.
The cost of maintenance and cost of expected repairs and cost of parts plus cost of original installation will never pay back the $1-8 monthly savings on gas bill. All costs are energy.
Make sure there is qualified service technician in area before buying tankless.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 24, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Failing ignition on Bosch Aquastar AQ125-HX tankless on demand water heater. Carefully followed all directions on device to best of ability. Gas supply is full and on. Water pressure should be...

Before calling service technician, open following links for Bosch troubleshooting resources:
Resources at Bosch
Typical Bosch Aquastar manual:

All tankless and tank-type gas water heaters require regular cleaning and maintenance.
It is unknown if your unit needs maintenance or repair parts, but catching up on maintenance using information from manual is good place to start.
Gas appliances are increasingly complicated and experienced technician is good resource to have in local area before installing tankless.

Apr 16, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

The heater is only kicking on low as the wate demand goes up the temperature of the water drops because the heater is not kicking up like it used to. The heater is a little over a year old.

See image larger

-Tankless water heaters are susceptible to lime build-up if not de-limed each year.
-Hard water will clog pressure-sensor and cause failure within 2 years if filter and softener are not working.
-Water flow and water pressure sensors inside tankless are succeptible to hard water deposits.
-Low water pressure from clogged pipes to municipal water problems to water well pressure valve can affect tankless burner
-Low-flow shower heads may not engage burner.
-With tankless-gas water heaters, sensors inside combustion area detect when incoming air flow is not adequate ... inspect inflow
-Your manual probably has a troubleshoot section.
-The manufacturer will refer you to installer.
-If you self-installed unit, that will void warranty to my understanding.
-There are water heater forums 1 2 3 4
-There are plumbers who will each have a different opinion
-There are Fixya experts who get paid to tell you the above.
-And there are local plumbers who are authorized dealers of the brand of tankless who get paid to fix them

Oct 07, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

I'm curious about Bosch Hydro Generated Ignition used in tankless hotwater heaters. I believe a spark is generated by a small turbine driven by water demand... how reliable is this system? Can it be...

Experienced this a lot in Australia. After lots of hassle I went back to the battery operated model. The turbine can get stuck if you have debris in the water and I found it just something else to go wrong. Sounds like a good idea in theory, guess I am just an old school guy; keep it simple!!!

Apr 18, 2010 | Bosch PowerStar AE3.4 AE3.4 Point-of-Use...

1 Answer

Tankless on demand water heater.

Tankless water heaters normally take a little longer than a regular heater to provide hot water because they have to start and get warmed up. I'm guessing the heater uses a pilot light and that the short amount of hot water when you turn on the tap is hot because when the water is sitting still in the heater the heat from the pilot light is enough to get it hot. The tub faucet will get hot a lot faster than the shower because it lets a lot more water through and empties out the pipes faster than the shower. You could probably speed things up by letting the tub faucet run on completely hot for like 10-15 seconds and then turning on the shower.

Oct 24, 2009 | RTO Takagi Jr. TK-JR-N Tankless Water...

1 Answer

10 minutes into my shower i get a spurt of cold water... whats wrong

check your gas pipe size and make sure it can keep up with the demand. also check your filter to make sure it's not clogging off with debris

Oct 01, 2009 | Rheem EcoSense by 4.2 GPM Tankless Water...

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