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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  • Noritz Master
  • 5,245 Answers

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

Posted on Jan 04, 2013

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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

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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

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.

Feb 16, 2013 | Water Heaters

1 Answer

The Noritz HW Heater has been tripping out some (usually whenever the shower is running, and someone turns on cold water). LED flashing three times. Any Ideas


This is probably a 16 error code. This code indicates the outlet water spiked above the set temperature for an extended period. It usually means the heater needs to be descaled or the manifold pressures need to be adjusted.

Mar 10, 2011 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

I have had this noritz for about 5 months. It has had some trouble coming on lately and the water is not as hot as it should be. I ran the water right out the bottom of the machine and it does not come...


it sounds like you have issues with scale building up in your heater. I would recommend performing a descale to remove scale deposits. Sometimes the scale blocks water flow through the heat excahanger; you may need to have a servicer dig the scale out of your main servo and mixing cylinder before performing a descale.

Sep 06, 2010 | Noritz 8.4 Gallon Residential Tankless...

1 Answer

Getting error code 16. what does it mean and what


a 16 error code is typically caused by scale formation. I'd recommend performing a descale on the heater.

Mar 06, 2010 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

I have a noritz water tankless heater and hot water stopped. Red light blinking three times. Need help.


Three flashes typically indicates the unit is overheating due to scale. I'd try a descale initially and see if that remedies the problem.

Dec 27, 2009 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Error code 14 shows on the remote for a noritz tankless lpg water heater. what does it mean?


This means the thermal fuse has broken and needs replacement. The thermal fuse is a white cord which wraps around the heat exchanger. It typically breaks if the unit is excessively dirty and sooted. Before the fuse is replaced you should make sure the unit is cleaned with compressed air and descaled.

Dec 10, 2009 | Noritz 6.3 Gallon Residential Tankless...

2 Answers

Sediment in lines -Bosch Tankless Water heater


I would recommend a simple sediment filter housing be installed on the main water line coming into the house. Material cost about $100. Have a plumber install a bypass loop so you can just shut off 2 valves when you need to change it. I always install one with any tankless heater as cheap insurance against such a problem. As far as adding something to clean the lines I would refer to the manufacturer's instructions and use only what they recommend in order to preserve your warranty. For a solar water heater I prefer Velux.

Please rate if this helps-

Mar 28, 2009 | Bosch & Tankless LP Hot Water Heater

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