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

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Bosch 1600h NG not heating water hot enough

My Bosch 1600h NG will not longer heat my water to as hot a temperature as when I first purchased it (about 2 years ago). If I limit the output flow of water I get almost hot water, but no pressure. I adjusted the knob for the flow rate (on the water heater) to the lowest flow setting (hottest water) and the only other setting is for the flame size. When I remove the cover, I have found that the flame size never changes (up or down) when I tunr the knob for the flame size on the water heater. Is the knob the "regulator" for the flow of gas? Anyone had this same problem? Does something need replaced (that I might be able to replace myself)? Bosch customer support has so far been not helpful.

Thanks

Tim

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  • Anonymous Mar 07, 2009

    I have the same problem. I have played with both the flow and the heating setting but can't get the water hot enough to take a comfortable shower. My old Bosch tankless heater was much better.

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Your 1600H tankless unit has a polymer watervalve on it. I have found that its not the greatest of designs. I would suggest rebuilding it and paying attention to the venturi and make sure everything is cleaned and relubed properly. This should take care of your issue.

Posted on Jan 19, 2009

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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.

Posted on Jan 09, 2009

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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...

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

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

Takes a long time to heat water. Brand new Ge 50 gallon water heater. Once heated it right temp,just a long time to heat it and then won't maintain hot water. Is gas line to small? 3/8 copper line. Thanks


If you are using a 3/8" copper line for your gas, get it replaced ASAP. It will fail. 1/2" Black Iron is required with natural gas. 50 gallons is a lot of water to heat. Look on the heater label for the recovery rate.

Feb 27, 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

Takes long time to heat then goes from hot to cold.


I know that this is a great answer but with out being there its hard to answer you call there tech support they are great, I have had to call they from jobs before they can help
Phone Support:
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729

Feb 03, 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

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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