Question about Noritz 6.3 Gallon Residential Tankless Water Heater - N-063S

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How to descale a noritz tankless water heater

Since the cost of 'descaling' the water heater is so much (almost half the cost of the heater itself) is there any way I can do it my self?

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1) Copy following links for general descaling resources for Tankless:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime

2) Add a comment with what you discover

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

Posted on Jan 04, 2013

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Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

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Good luck!

Posted on Jan 02, 2017

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SOURCE: I have a descaling cost question. I just got

I would get a new unit, because you still have an old unit that will fault again, get a new one with a 10 year warranty... ya good to go.

Posted on Feb 24, 2010

Testimonial: "Thank you! I was leaning that way. :> "

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1 Answer

Descale a showerhead


  1. What to do
    1. Unscrew the head of the shower from the hose. This may be quite stiff. ...
    2. If it is possible, unscrew the rose attachment from the shower head. ...
    3. Soak the parts in the descaling agent or white vinegar overnight. ...
    4. Reassemble the parts, checking that the rubber washer for the hose is in place.
Descaling shower head

Jul 21, 2015 | Water Water Heaters

1 Answer

I have a wall mounted tankless water heater for


It's scaled
Do you have a softener? Water must be 15 GRS/PPM or less in iron and calcium. Hot spots in unit are boiling water and are causing the noises.
Descale and flush unit following Rinnai Specs and check water hardness for compliance with Rinnai standards because too hard an inlet water will VOID the Heat Exchanger Warranty (10 year).

Oct 19, 2014 | Water Heaters

2 Answers

What is code blinking 20 on noritz tankless hotwater heater N_069M


The error is a HIGH LIMIT THERMAL ERROR. That means Calcium buildup has appeared in the unit. It is also called scale. To clear the error you have to power it off. That is done by the circuit breakers. You should descale the unit first though.

Jul 26, 2014 | Noritz Water Heaters

2 Answers

Powerstar ae125 runs hot then cold in shower


Increase your flow, sounds like you are right at your activation rate.
1 way is to turn down the temp on the machine, so you dont have to mix in so much cold at your shower. Check to see if your mixing valve is bad, or your showerhead has restriction/scale built up in it.The other way is to turn on your lavatory fixture full hot before showering(which will keep hot water flowing through the machine as you adjust your temp to be comfortable.

Nov 24, 2013 | Bosch PowerStar AE115 Tankless Water...

1 Answer

Bosch 125fx heater barely heats water


1) Recommend replacing tankless with ordinary tank-type gas water heater.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://hometips.me/Mar/Which-is-best-gas-water-heater.pdf

2) Tankless cannot be exposed to more than 11 grains hardness in water or unit will fail within 2-5 years. Water softener is required.
http://hometips.me/Tls/Battelle_Water-softening-research.pdf

3) Descaling tankless water heater each year will not restore functionality, or restore efficiency of tankless, nor restore full efficiency to tank-type gas water heater.

4) Bradford White side-by-side testing research comparing their tankless with their tank-type shows that tankless will save $1-8 per month on energy bill vrs ordianry tank-type ....but conclude that tankless 'fall far short of payback' due to maintenance, repair, installation and replacement costs.
Study compared full cost, and not just monthly energy bill, since All costs are energy.

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

Feb 16, 2013 | Water Heaters

2 Answers

Rheem water heater rtg95dvn keeps blowing 3 amp fuses


Not for sure what your root cause was and I know it's a little late but I just suffered this same exact scenario on the same water heater. Storms came through, power went out, power came back on and the water heater keeps blowing the 3 amp fuses now. I removed all the cables and plugged them back in one at a time. When I plugged in the Fan Motor connector the fuses blew. Installed new fuses with the connector out, the Fan Motor was putting out 150 VDC through the connector port (on main control). I pulled the control from the unit and Q1 is visible blown and disintegrated on the control board. Obvious control design issue. I've ordered a new control and will put a surge protector on the heater now when the new control comes in. Very disappointed that this was not caught in controls testing within the manufacturers facility. New control is not very cheap. Half the cost of a new Heater. Hopefully the Fan Motor survived the high voltage with the fuses blowing. I'm putting this here for anyone else that suffers the same issue on this water heater or the Richmond equivalents as they use the same control.
rheem-water-heater-rtg95dvn-keeps-lig2cnfgd44b3pejpipwueov-2-0.jpg

Jul 31, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

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.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
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.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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

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