Question about Bosch 1600H-LP Liquid Propane AquaStar AquaStar Liquid Propane Tankless Water Heater

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Bosch 1600H-LP Overheating Problem

We use the Bosch 1600H-LPto heat our water, had no problem until last week when it started overheating the water, I'm afraid of getting burned.

Is this a known issue with this device? How can i fix this problem? Will it return?

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Did you check to see if your temp regulater is working properly? also you have a thermocoupler that senses the heat of the water and works in conjunction with the regulator. have either one or both replaced and the problem will be solved. please rate this thanks

Posted on Sep 02, 2008

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Posted on Jan 02, 2017

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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 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

1600h same problem with ingiter


It is a control box issue but now I have to decide if I want to spend $270 to fix or for $299 buy a regular water heater. By my calculations being this is year three, the 15 year life expectancy of this 1600h water heater will cost me $1500 in parts alone.

Sep 01, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

5 Answers

Problems with bosch 1600h ng tankless wh igniting


I found that the solution to my issue of not igniting was due to a bad pilot electrovalve part #8708501249. It was about a $50 part that was bad from the start.
Really disappointing that Bosch's QA would let a such a defective part ship. I spent about 3 years of using a workaround with a fan blowing air to get ignition until it finally failed. I had a tech look over the system to point me in the right direction.

Mar 23, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

No hot water


Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

Mar 01, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Won't get hot enough or last as long as it used to


You could try to adjust the thermostat to a higher temperature. Let me know the results.

Good luck...
Aduz

Feb 22, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Bosch water heater won't heat as hot or as long as it used to.


Is it protected by a water softener?

Have you cleaned the inlet screen and flow valve?

Your problem is likely in one of those areas. If not them then you may have to backflush the heat exchanger (if you don't have a softener). The manual tells you how to do that.

Mike

Feb 22, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

1 Answer

Bosch 1600H NG


I hope this helps!
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/1600HTechSupport/Troubleshoot/tabid/1094/Default.aspx
Copy and paste to google search engine!

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

2 Answers

Bosch 1600h NG not heating water hot enough


it sounds to me like the dip tube has failed. this is a plastic tube that is inside the water heater on the cold side. It is designed to put the incoming cold water at the bottem of the tank allowing heated water out at the top. when this tube deteriorates the cold water mixes at the top of the tank instead of the bottom. a new dip tube is about 5 bucks but must be inserted on the cold side by someone with plumbing experience.

Jan 08, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

2 Answers

Just not hot enough


Hi Ken Tankless Water Heaters typically heat to a 80 deg temp. rise. Per a set time it takes the water to pass through the heat exchanger. Matter of seconds So at 130 deg F. Your heater is working fine. Did you take a heat measurement or are you looking at the set points inside the cabinet? To get the 130 deg F you need to upgrade the sensor available from your Bosch Dealer. Typical output water temperature would be 110. There are scalding issues over this set point. As long as you have 3/4 id pipe in and out and have insulation on the discharge side of the heater at all exposed points of the pipe. Your system was likly installed properly. Look it is only my opinion but Bosch it the best you can get in Tankless heaters. As for the dishes. Use the sanitize setting on the dishwasher or alittle extra bleach in the dishwater. And don't forget to rince with fresh water only. For the shower or tub. Use less cold water in the mix. Tankless water heaters were designed to use less resorces aswell as energy. And I want to thank you for that.

Jan 05, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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