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

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I want to build a tankless hot water heater. does anyone have any plans for this?

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There are no plans for electric or gas units available that i know of. If your intent is to build an electrical one (strongly discourage the use of gas built devices at home), the basic construction is flow switch for activation, leaving water temperature sensor (make sure you do not over heat), heating elements (big ones), 2 pipe connections to the shell covering the heating elements and whatever bells-and-whistles you might need to match one of the big manufacturers.

Building one, as compared to purchasing, does not sound like a good idea to me. Electric units are not too expensive and hopefully the idea of gas-home-made is a bit scary (but not trying to dissuade you).

Have you calculated how big your tankless system should be? Do you have enough power available or will you need the services of an electrician. more info at http://www.mechanicalengineeronline.com/Mini_Sites/Tankless_Water_Heaters_Ebook/Tankless_Water_Heaters.htm

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Posted on Jun 10, 2009

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Go to rinnai web site they have all the descriptions of what is there and how it is together, i hope this helps you out in your venture

Posted on May 29, 2009

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1 Answer

Error c4-15 what does that mean


Before calling service technician, copy following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

Aug 26, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

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.

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

2 Answers

My family is moving in...how do i increase hot water availability?


large water heater, turn p the themo stat to a higher setting ( watch for burns with young childern and older folks)

or the best install a tempering valve. this valve mixs hot water with cold water before it goes into the building.

Again if you have young ones or old people they can burn faster than any other group.the best is a larger heater for the DIY person.

Thanks Tom

Sep 13, 2011 | Rheem Water Heaters

1 Answer

Flashes il


Before calling service technician, open following link for Rheem tankless resources including error codes and possible manual.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Read your manual for troubleshooting, advisories and required maintenance.
Tankless are maintenance heavy.
1L means tankless heat exchanger has lime build-up.
De-lime tankless unit.
U-tube has videos for de-liming tankless, but there is more to consider:

De-liming is yearly maintenance requirement.
Tankless are prone to lime build-up
Regular de-liming will not restore full efficiency to tankless unit.
Tankless cannot be exposed to water with more than 11 grains hardness.
Temperatures over 135 can cause minerals in water to harden on metal surfaces of any water heater.

Also clean Tankless water filter each month, and clean and maintain burner and combustion chamber yearly.
The cost of maintenance and cost of expected repairs and cost of parts plus cost of original installation will never pay back the $1-8 monthly savings on gas bill. All costs are energy.
Make sure there is qualified service technician in area before buying tankless.

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 24, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Replaced thermocouple on Bosch TF250. Now the pilot flame is so big that it heats and boils the water in the heat exchanger when hot water is not required. When we turn the tap on, we get dirty water,...


Before calling service technician, open follow links for troubleshooting resources.
Bosch site does not show TF250, but shows 250SX and 250SXO.
Gas Products Technical Support: 800-642-3111
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx

At no time when visiting tankless website have I read suggestion that people fix tankless as a do-it-yourself project. In fact each site says repeatedly to call service technician for installation and repairs.
When reading service bulletins, the repair protocols are generally long and very sequential, even if a thermocouple seems straightforward there are many interrelated parts and sensors that must communicate exactly with each other.
Example: following pdf outlines operation sequence for non-standing pilot model
http://waterheatertimer.org/pdf/Tankless-gas-operation-overview.pdf

The dirty water also suggest that tankless has not gotten regular maintenance that is required for continued operation. Tankless are not install-it-and-run-flawless-for-years type of machine.
Read manual for specific maintenance required for your model. For example yearly flushing the heat exchanger with vinegar to avoid lime build-up is suggest most models. Tankless are succeptible to lime build-up.
All costs are energy. Maintenance alone can easily eat up the promised $1-8 monthly savings from tankless vrs tank-type water heater. One service call can wipe away years of expected savings, plus replacement part can sometimes cost as much as whole new tank-type water heater, installed.

Apr 17, 2011 | Bosch AquaStar 125FXKIT-NG 125FX Natural...

1 Answer

My hot water pressure has been reduced to about 40% of what it used to be / or what the cold water pressure is. Does not appear to be a blockage in pipes, as pressure is the same at all hot water faucets...


You should check the inlet filter. Most (if not all) tankless heaters on the market have a small wye strainer on the inlet cold water connection. If debris build up in this, the water flow will be restricted.

Other than that, I'd check aerators at your fixtures, and if possible check the outlet pressure on the hot side of the tankless. If you have isolation valves, you can just run the water straight through. If the flow is restricted at the tankless, then you know the problem is in the heater or in the cold water supply. If the water flows quickly out of the tankless, then your problem is a clog in the water system after the heater.

Sep 28, 2010 | Rheem Water Heaters

1 Answer

The flow is more than it used to be when the Rinnai was working fine with two faucets flowing probably triple the advertised flow rate now. It still cycles hot and cold every few minutes. Is build-up a...


when your tankless starts cycling hot and cold water, then there is probably scale buildup inside the unit.
flushing the unit will remove the scale and any other debris inside the unit.
you can do this yourself, do you have the instruction book that came with the tankless heater?
it is recommended to flush the unit once a year especially if you have hard water.
it takes an hour or maybe a little longer to flush the unit completely.

Aug 29, 2010 | Bosch & Tankless LP Hot Water Heater

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