Question about Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater...

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We had a professional install the Bosch tankless 1600 H NG water heater a few months ago. From the beginning it would take five to ten minutes for the water to get hot, what a waste of water. And once I get the shower temperature where I want it, the water just keeps getting hotter and hotter and if I adjust for cooler water the hot water stop completely. What to do?

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1) What you describe does not sound like normal.

2) Since you do not have error code, issue could be plumbing problem.
http://waterheatertimer.org/pdf/No-Error-Code.pdf

3) Open following link for useful troubleshooting information.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

4) Tankless installation and repair is a developing and complicated field as tankless numbers increase and companies hone their products, and customer relations, and installers get trained and certified.

5) I suggest you read your manual over and over to discover necessary maintenance and possible tricks and tips needed to keep these high-tech units working.

6) As a general rule, Rheem will refer you back to installer.
You might want a second professional technician to look over the problem to double-check first guy's work.
A lot of professionals will not get involved if they know they are assessing another guy's work.

Add a comment with your experience so other with same-similar problem can benefit.

Also 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.

Posted on Mar 25, 2011

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No hot water


Before calling service technician, open following link for Bosch troubleshooting resources including Bosch contact number and possible manual:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Tankless water heaters require yearly maintenance to check gas pressure, inspect and clean burner and combustion parts, inspect vent and vent drain, clean air filter, check water flow, de-lime the heat exchanger etc.
This maintenance can stop ordinary problems from occurring, and can be done by the homeowner by reading Bosch service manuals for specific model number.
The continual maintenance, and cost of repairs and parts, and cost of professional service are more expensive than expected $1-8 monthly energy savings from owning tankless.

Fix most tankless problems yourself, same day, for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 12, 2011 | Bosch 425HN NG Tankless Water Heater

1 Answer

We have a bosch tankless water heater in a 1600 sq ft home...it works great except in one faucet (the spare bathroom sink)...sometimes the hot water comes out, sometimes it doesnt, sometimes it takes...


Since you have hot water at all the other fixtures, the problem lies in the sink, not the water heater. It could be that the sink is farther away from the water heater than the other fixtures. It would take longer to get hot water.

Aug 29, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

We installed a Bosch 1600h ng tankless and it will occasionally ignite but not regularly??


Before calling service technician, open following links for Bosch troubleshoot resources:
1) General resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

2) Sales page: Notice the paradoxical promotion of unlimited hot water that saves 50% off utility bill.
http://www.boschhotwater.com/BoschHotWatercomHome/GasProducts/BoschModel1600H/FeaturesandSpecs/tabid/1024/Default.aspx

3) 1600H troubleshooting. Click each item and it opens drop down menu that also has links to service bulletins. Lots of reading, but a great way to get familiar with your product.
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/1600HTechSupport/Troubleshoot/tabid/1094/Default.aspx

I do not recommend tankless for the number of difficult and expensive problems, the required yearly maintenance, plus the specific need for incoming air quality, sufficient quantity of gas, water quality, water pressure, water volume, and correct venting and drainage of vent condensation. And never recommend self-installation since most tankless manufacturers refer immediate problems back to the installer.

Assuming the tankless was installed correctly and not defective:
Other problems can be caused by household conditions.
For example crossover:
http://waterheatertimer.org/Crossover.html
Tight house: tankless require more incoming air than tank-type because they burn so much more fuel per minute of operation:
http://waterheatertimer.org/pdf/Bosch_Ventilating_tight_houses.pdf
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
Low water pressure:
http://waterheatertimer.org/Low-hot-water-pressure.html

Take a moment and vote on answer:
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.

Aug 27, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

I have a Bosch Tankless Water HEater Model GWH 2700 ES NG with an error code of A3. I was told to push reset and the problem would be resolved. This worked several times and now it doesn't work. ...


Yes. Contact Bosch.
Error codes are considered start-point for troubleshoot.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Tankless are complex electronic machines.
If on-site plumbers cannot figure out problem, then you need trained service technician with a service manual for your specific product, who can ohm-test the electronics.
Bosch will have a list of trained service technicians. And maybe Bosch has another step for fixing problem yourself.

Fix most tankless problems yourself, same day, for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Aug 14, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Hi, I have the 1600 NG tankless water heater. Everything works great, but I installed low flow hot faucets throughout the house and now the igniter will not click on. It works for the washing machine. ...


http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html#flow
1) Tankless require minimum flow rate before burner will activate.
2) Sounds like the water pressure drops quickly when faucet turns on. This implies combination of problems including sediment build up inside lines, crossover at single-handled faucet, or sediment filter clogged or water softener clogged.
3) Low flow faucets can reduce needed flow rate.
4) Other problems can contribute: sensor failure, loose wires, PC board failure, high temperature setting, cold incoming water temperature during winter months.

Jul 20, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Roblem with the Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater... Aquastar gwh 1600 h igniter fails clicks does...


Problem could be air supply, gas supply, venting, part failure or combination of listed things.

Best place to start is manual.
http://www.boschhotwater.com/BoschModel1600H/FeaturesandSpecs/tabid/1024/Default.aspx

Typical 1600 manual shows troubleshoot starting page 19
http://www.boschhotwater.com/Portals/7/TechManuals/1600H_English_0606.pdf

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

BOSCH error codes:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Add a comment for more free help.
Also 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.

Mar 05, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater. Problems with constant hot water. The heater turns ok but (i think) when i turn on the cold side the heater stops. at...


Possible flow sensor issue. Check to see if your water pressure fluctuates a lot or is fairly steady. These units are sensitive to the pressure. take care.

Feb 19, 2011 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

I had our 1600ng Bosch water heater installed a month ago during warmer weather. It is not providing very hot showers. I use all hot no cold. how can io get more heat


on the front of the water heater down at the bottom there is a thermostat (usualy a blue knob) turning it clockwise will increase the tempature of your water
(good Luck)

Oct 12, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Can't light my Bosch 1600 P tankless water heater.


make sure gas has been purged check pilot and thermal coupling

Aug 27, 2009 | Bosch 1600P-NG Natural Gas AquaStar...

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