Question about Bosch 2700ES Natural Gas AquaStar AquaStar 2700ES Tankless Water Heat

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Seven months ago, a bosch alled at my house

Seven months ago, a bosch 2700es was installed at my house according the required specification. the unit worked fine since then until last months then often resetting were needed and error messages comes up. is this normal for almost a brand new unit to behave???? please help. thank. brooklyn, nyr

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You will always have this problem in city type of appltcations.there is too much of a flow differation.

Posted on Jul 15, 2009


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Error codes E1 and most recently EC. We have been geting fluctuating hot and cold and now only cold water. I have replaced the OTS, cleaned the inlet filter screen, descaled the tank, with no success. ...

You had service techs and Bosch techs and neither can find a solution.
I assume you want impartial opinion at fixya.
Multiple error codes and a lack of progress by professionals implies PC board failure. BUT there could be multiple problems. Error codes are considered 'start' point for troubleshooting. Beyond that, Bosch should give you contact information to a trained professional service tech >> not just a plumber, but a guy who can do the electronic diagnostic.
Open following link for Bosch troubleshooting resources.
Tankless are high tech gadgets that cannot be exposed to more than 11 grains hardness in the water, and require continual maintenance. The cost of repairs and maintenance will never pay back from the expected $1-8 monthly energy savings.
You can solve most tankless problems same day for $350.
Then sell the tankless unit back to Lowes or sell it for parts on auction site.

Jul 21, 2011 | Bosch 2700ES-LP Propane Tankless Water...

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Need to convert 2700ES from NG to LP and just purchased the conversion kit. What is the proceedure? Can not find a Bosch tech to do the conversion in this area (12430). I am told that I need special...

I don't have good news.
You are attempting a conversion that local technicians are refusing to do.
There is a reason why we service guys steer clear of some things: liability and continual problems afterward.

Contact Bosch and find the service bulletin for that procedure.
After all this is a highly technical and finicky machine hooked to a gas line located in proximity to people.

If this procedure is going to cost more than $400-600, and remember there is a risk it will not work afterward or will be a continual problem, then consider installing tank-type LP water heater from local box store. I recommend this.

For others in same situation: NG to LP conversions are not supported or recommended by every manufacturer. This applies to tank and tankless.
Also check there is a qualified service technician in your area before installing tankless.
Read the manual before buying.
Tankless gas savings are $1-8 per month, but all costs are energy.
Tankless cannot be exposed to more than 11 grains hardness in the water.
Tankless are maintenance heavy, and with expected repairs, maintenance and cost of parts, cost of machine and replacement cost, a simple tank-type water heater is cheaper by far.

Upvote the help.
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.

May 18, 2011 | Bosch AquaStar 2700ES-LP

1 Answer

Hi, My Aunty and Uncle have a Bosch Hydropwer 16H at there holiday house. About a month ago the heater would not produce a spark, they got a plumber out to have a look at the heater. He said it was the...

No, I do not know.
Open following link for Bosch troubleshooting resources.
Tankless require yearly maintenance as covered in manual. They require correct venting, gas pressure and/or electric current, they require specific incoming air quality, incoming water pressure and flow, and can stop working with basic electric problems, plumbing problems due to check valve or sediment blockage in line, or single-handled faucet crossover, and the myriad of sensors and parts each work together in a specific pattern that can be interrupted by any small or large failure, or by multiple half-failures. As a general rule, repairs are not do-it-yourself, and each part has an installation protocol. But it's supposed to last 20 years, while the maintenance, parts and service will exceed the expected 1-8$ per month savings.

Solve problem for 317$ at Lowes:
Do yearly maintenance, and this too will last 20 years with cheaper parts and cheaper overall cost, since all costs are energy.

Apr 21, 2011 | Bosch Water Heaters

1 Answer

Water temp. at the tap fluctuates

It is likely the inlet filter is plugged. this reduces the flow and then the heater adjusts the burn rate down to protect itself. the filter screens are small and plug easily. It would be a good idea to install a larger pre filter on these heaters.

May 30, 2010 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Upsstair shower doesn't supply continuous hot water, downstair works great. Water pressure problem?

It could be a water pressure problem but most water supply companies put out enough pressure for a 2 story house (or even 4 stories) easily. Can you clarify what you mean by continuous? Does the water get cold, on and off (i.e. no hot water) or does it vary in temperature mildly?

Mar 12, 2010 | Bosch 2700ES Natural Gas AquaStar ...

2 Answers

My old Aquastar tankless natural gas water heater used 1/2" gas line. My new Bosch 2700ES -NG says it requires no less than 3/4" inside diameter gas line. Do I have to replace all the gas supply lines...

None !!
3/4 pipe from gas meter or regulator. At low pressure there may not be enough gas flow through a smaller pipe for the boiler when on full bore.
The boiler input pipe will be 1/2" needing a reduction from 3/4 so there is some leeway.
I have about 8' of 1/2 pipe on mine [Bosch Worcester] from the reg. and it is ok.
You could use the existing 1/2 and try. No harm done if insufficient-just replace. If you have some other gas takeoff on the same line a 3/4 pipe up to that take off is most likely.

Jan 29, 2010 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Recently installed a Bosch 2700ES. I am getting

unplug power or turn off power,reboot, and try again

Jul 04, 2009 | Bosch 1600H-LP Liquid Propane AquaStar...

1 Answer

Bosch 2700es natural gas unit keeps going out requiring a relight

Actually, this comment if coming from the math building at LSU!!!! How nice.

Any ways......You probably have a faulty thermo couple. It is the easiest and cheapest thing to do so try that. Most units have reverse threads so keep that in mind when removing. It is identified by a copper wire that leads to the main control unit. It should also be held in-place by some clips that just pinch the copper in place. Replacing the new one will be just the reverse of the removal.

Hope this helps

Apr 14, 2009 | Bosch 2700ES Natural Gas AquaStar ...

1 Answer

Bosch AquaStar 2700ES NG - C7 error

Hope this helps. Be careful of electrical shock!
Copy and paste in URL:/Location bar

Jan 30, 2009 | Bosch 2700ES Natural Gas AquaStar ...

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