Question about Bosch & Tankless LP Hot Water Heater

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Hot water problem

I have a Bosch on demand hot water heater that is suppose to handle 2-3 functions (2-3 water outlets) at once. If someone is taking a shower and another person washes their hands with even minimal hot water the shower water gets cold. Any sugestion?

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  • j50eckel Jun 11, 2009

    Thank You
    I will never purchase or recommend one of these units to anyone. They are very expensive and need adjusting (I can't find anyone who adjusts this unit ).Also if you have a water balancing fixture in your shower this unit does not well with it. NEXT TIME I'LL BUY A HOT WATER TANK!!!!!

  • j50eckel Jun 29, 2009

    Thanks for the info. Why a $1000.00 unit cannot not supply 2 faucets is beyond me. For what they do they are way overpriced.

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Someone has not sized the system correctly. The water heater will heat a certain GPM a certain temperature rise. Most of those "generalizations" from the manufacturers are referencing the lowest of all the flow requirements like 2 lavatories. The truth is, don't use other fixtures while showering or get a bigger system. Lots of information related to sizing the tankless system at http://www.mechanicalengineeronline.com/Mini_Sites/Tankless_Water_Heaters_Ebook/Tankless_Water_Heaters.htm Have a good one. PS:Properly sized On-Demand water heaters are actually really good. Be prepared for the day your water heater quits.

Posted on Jun 10, 2009

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Hi, if you have a symmons shower valve they make a replacement stem that will balance the amount of water going to your shower valve. I have delt with Bosch units for yrs and main problems that i run into is wrong installation, or the type of fixtures that that they are supplying, meaning that they pull tooo much water great when u shower but like you said when a person turnes on a sink it goes cold thats from too much water passing thru the heat exchanger. What unit do you have, 425hn will cause most likely that problem. If you have a 635esn you may not have your flame up highenough. let me know what u have for a unit. thx

Posted on Jun 24, 2009

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Turn the temp to max...sadly on demand water heaters aren't very good.

Posted on Mar 11, 2009

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On demand hot water heater gets cold for a short while during showers.


Check for crossover.
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http://waterheatertimer.org/Crossover.html

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


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Water takes 30 sec to cover 10m from heater to tap


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1/2" pipe has inside diameter of .54" and holds 1.2 gallons per 100 feet
10 meters is 32 feet and holds .4 gallons
Average faucet puts out 2 gallons per minute, so 30 seconds you should get 1 gallon of water.
Put a bucket under faucet and check amount of water flow.

Assuming you draw just hot water from the faucet, then 30 seconds is slow for receiving hot water.
If you have single-handle faucet and raise handle straight up in middle, then you are drawing half hot and half cold, so it would take 30 seconds for hot to arrive.

If hot water is slow, the problem might be crossover.
http://waterheatertimer.org/Crossover.html
or low water pressure due to clog in water line
http://waterheatertimer.org/Low-hot-water-pressure.html
Other problems could include clogged water filter, clogged water softener, defective pressure valve, and low water pressure.

Sources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/Water-heater-recirculation-system.html

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

Upvote the help.
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Sounds like you may actually need to have the unit recalibrated by a Bosch Authorized Technician. Bosch Tankless units MUST be cinstalled and calibrated by a factory trained and certified technician as they are the only ones who have the proper tools for setting up the units.
If you did not have it installed by someone who is certified by Bosch, I would recommend that you call Bosch Service and get the name of someone who is.
I myself have a Bosch NG2700 unit and have never experienced any issues with it not working. Could be that the device is wired into a branch circuit of your home that is having problems or is underrated for the unit.

The heater should be plugged into an isolated 15amp minimum outlet.

Check the breaker/outlet, then call Bosch service next. The units have a 12 year warranty, so get it checked out. You may have to pay for the labor, but if they are certified and have the calibration unit, it should run you no more than a 1 hour call.
Keith

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if its not a fuse or the ingniter isnt functioning you may need to call a heating person who knows on demand or check Bosch on line maybe they have the trouble shooting guide if you dont.

sorry that all i can suggest hope it helps

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