Question about Bosch ProTankless GWH 715 ES LP Tankless Water Heater, Propane

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The water fluctuate very hot to very cold and sometime runs for long time before getting hot water. bosch gwh 715es

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Either you main controller is bad, or the thermo couple is faulty


Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Posted on Jul 22, 2010

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Posted on Jan 02, 2017

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My GWH 715 ES cannot restart after hot into cold water crossover


Check for obstruction in your watervalve. It has a flow meter, that needs to spin freely. Remove the watervalve and blow through it, you should hear it spin.
Also make sure you dont have an error code showing. Hold down your reset button for 5 seconds to reset an error code and get back to your set temp.

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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.


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.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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

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The water wont get even warm its just plain cold! we have tried uplugging it we have tried turning the hot water on and off to restart it as it says and non of this is working!!! we have a bosch GWH...


The gas flame igniter is not working properly.

Go to the link below and type in your model or select it and the instructions take you through the gas pressures and so on.

Feb 02, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Hot water tank does not work when shower is on, it does however work when the faucet in bathroom is on. It quit working in the shower about a month ago.


  1. COLD MIX, HEATER DEACTIVATES
    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
  2. FLUCTUATING WATER PRESSURE
    If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate. The minimum water pressure for the home should be 30psi or greater. For people on well systems the minimum pressure range is 30-50psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant water pressure to the water heater. Watts brand 25AUB- ¾" or N35B-¾" pressure reducing/regulating valves or equivalent is suggested.
  3. CHANGING FLOW RATE
    Major changes in flow rate can adversely affect the output water temperature of the heater. Increases from one major fixture running to multiple fixtures running at one time can cause the temperature to fluctuate. Stay within the heater's specifications. See: TWH E2-03 Outlet temperature vs. flow rate [PDF].
From the Bosch website.

Good Luck,
Gary

Dec 16, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Hello, I purchased a Bosch model # GWH G35 ES N about 4 years ago and have continuous problems with the sensors. I've replaced the hot side outlet sensor #0711 at least 4 times and the cold side # 0616...


the main problem is...

you purchased a "Bosch" Aquastar.... complete garbage

if you want quality tankless..
Takagi, Rinnai, or Noritz. these are the only tankless I install or work on, very few if any problems.
just look on the board here, most of the problems listed are with the Bosch

Jul 10, 2010 | Bosch Water Heaters

1 Answer

Bosch on demand tankless water heater gwh 2400 E LP error code "


BOSH AQ 250 On demand propane water heater ran out of propane, got gas now, but get EC flashing on the display and the unit won't fire? Lost manual, any suggestions. Thanks, Jim

Jan 06, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

Bosch Pro tankless water heater overheating


The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.

Mar 16, 2009 | Bosch ProTankless GWH 715 ES LP Tankless...

4 Answers

Keep getting error codes and have to reset too often


This paticular problem your having is specific to the jumper in the heater. The jumper is for condensing heaters. Your heater does not have the specific wiring or computer for condensing. So they added a jumper in the wiring. It is failed or failing. It should ohm out at about 120ohms. sometimes its just a loose connection. Check this out, and called 1-800-642-3111, they have been very busy, but leave them a message and they will call you back.

Dec 24, 2008 | Bosch PowerStar AE125 AE125 Whole House...

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